Topic-specific practice · 42 questions for every official topic

AP Physics 1 MCQ Practice by Topic 2027

Choose a topic to open its full 42-question bank. The topic links from lesson pages land directly on the matching bank, so a student reviewing Topic 1.3 is not sent to a short generic diagnostic.

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How much AP Physics 1 MCQ practice is available?

There are 42 original multiple-choice questions for each of the 43 official AP Physics 1 topics, giving 1,806 topic MCQs with answers, explanations and lesson routing.

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43 topic banks.
42 MCQs per topic.
1,806 topic MCQs total.

Verified for 2026–27Updated August 31, 2026How this page is verified

All 43 topic banks

Choose the exact AP Physics 1 topic

All 43 official topics are available. Each MCQ bank contains 42 original questions and each FRQ bank contains four prompts aligned to the four current free-response task types.

Topic 1.1Scalars & Vectors in One Dimension42 MCQs Topic 1.2Displacement, Velocity & Acceleration42 MCQs Topic 1.3Representing Motion42 MCQs Topic 1.4Reference Frames & Relative Motion42 MCQs Topic 1.5Vectors & Motion in Two Dimensions42 MCQs Topic 2.1Systems & Center of Mass42 MCQs Topic 2.2Forces & Free-Body Diagrams42 MCQs Topic 2.3Newton’s Third Law42 MCQs Topic 2.4Newton’s First Law42 MCQs Topic 2.5Newton’s Second Law42 MCQs Topic 2.6Gravitational Force42 MCQs Topic 2.7Kinetic & Static Friction42 MCQs Topic 2.8Spring Forces42 MCQs Topic 2.9Circular Motion42 MCQs Topic 3.1Translational Kinetic Energy42 MCQs Topic 3.2Work42 MCQs Topic 3.3Potential Energy42 MCQs Topic 3.4Conservation of Energy42 MCQs Topic 3.5Power42 MCQs Topic 4.1Linear Momentum42 MCQs Topic 4.2Change in Momentum and Impulse42 MCQs Topic 4.3Conservation of Linear Momentum42 MCQs Topic 4.4Elastic and Inelastic Collisions42 MCQs Topic 5.1Rotational Kinematics42 MCQs Topic 5.2Connecting Linear and Rotational Motion42 MCQs Topic 5.3Torque42 MCQs Topic 5.4Rotational Inertia42 MCQs Topic 5.5Rotational Equilibrium and Newton’s First Law in Rotational Form42 MCQs Topic 5.6Newton’s Second Law in Rotational Form42 MCQs Topic 6.1Rotational Kinetic Energy42 MCQs Topic 6.2Torque and Work42 MCQs Topic 6.3Angular Momentum and Angular Impulse42 MCQs Topic 6.4Conservation of Angular Momentum42 MCQs Topic 6.5Rolling42 MCQs Topic 6.6Motion of Orbiting Satellites42 MCQs Topic 7.1Defining Simple Harmonic Motion (SHM)42 MCQs Topic 7.2Frequency and Period of SHM42 MCQs Topic 7.3Representing and Analyzing SHM42 MCQs Topic 7.4Energy of Simple Harmonic Oscillators42 MCQs Topic 8.1Internal Structure and Density42 MCQs Topic 8.2Pressure42 MCQs Topic 8.3Fluids and Newton’s Laws42 MCQs Topic 8.4Fluids and Conservation Laws42 MCQs

Topic 6.4 · 42 MCQs

Conservation of Angular Momentum Practice

All questions are original. Check each answer for immediate feedback and explanation, then use the lesson link inside the explanation when a concept needs repair.

Topic 6.4 representation anchorUse the picture together with words and equations—not as decoration.

Question 1

A skater reduces rotational inertia from 6 to 2 kg·m² with negligible external torque. If initial angular speed is 2 rad/s, what is final angular speed?

A0.67 rad/sB2 rad/sC6 rad/sD18 rad/s

Question 2

An isolated rotating system doubles its rotational inertia. What happens to angular speed?

AIt doublesBIt halvesCIt quadruplesDIt is unchanged

Question 3

Which condition is required for conservation of total angular momentum about a chosen axis during an interval?

AZero kinetic energyBZero angular velocityCZero or negligible net external torque about that axisDAll internal torques must be zero individually

Question 4

A skater pulls arms inward and spins faster. Which Topic 6.4 concept most directly explains this physical situation?

AInternal torque transferBAxis choiceCChanging rotational inertiaDAngular vs linear conservation

Question 5

Which statement best defines Changing rotational inertia in Topic 6.4?

AIf L is conserved, decreasing I increases |ω| and increasing I decreases |ω|.BInternal torques can exchange angular momentum among parts without changing total system L.CExternal torque must be assessed about the same axis used for L.DA system can have one conserved quantity under conditions where the other changes, depending on external force and torque.

Question 6

A second situation is observed: A student on a rotating stool extends weights and spins slower. Which concept is being applied?

AAngular vs linear conservationBChanging rotational inertiaCInternal torque transferDAxis choice

Question 7

Two disks touch and friction redistributes L. Which Topic 6.4 concept most directly explains this physical situation?

AAxis choiceBAngular vs linear conservationCInternal torque transferDNo external torque condition

Question 8

Which statement best defines Internal torque transfer in Topic 6.4?

AInternal torques can exchange angular momentum among parts without changing total system L.BExternal torque must be assessed about the same axis used for L.CA system can have one conserved quantity under conditions where the other changes, depending on external force and torque.DConservation requires negligible net external torque about the chosen axis.

Question 9

A second situation is observed: A person twists relative to a platform causing opposite platform rotation. Which concept is being applied?

ANo external torque conditionBInternal torque transferCAxis choiceDAngular vs linear conservation

Question 10

A support force through the axis can have zero torque about that axis. Which Topic 6.4 concept most directly explains this physical situation?

AAngular vs linear conservationBNo external torque conditionCAxis choiceDChanging rotational inertia

Question 11

Which statement best defines Axis choice in Topic 6.4?

AExternal torque must be assessed about the same axis used for L.BA system can have one conserved quantity under conditions where the other changes, depending on external force and torque.CConservation requires negligible net external torque about the chosen axis.DIf L is conserved, decreasing I increases |ω| and increasing I decreases |ω|.

Question 12

A second situation is observed: Gravity may create torque about one point but not another. Which concept is being applied?

AChanging rotational inertiaBAxis choiceCAngular vs linear conservationDNo external torque condition

Question 13

A pivot force can change linear momentum while exerting zero torque about the pivot. Which Topic 6.4 concept most directly explains this physical situation?

ANo external torque conditionBChanging rotational inertiaCAngular vs linear conservationDInternal torque transfer

Question 14

Which statement best defines Angular vs linear conservation in Topic 6.4?

AA system can have one conserved quantity under conditions where the other changes, depending on external force and torque.BConservation requires negligible net external torque about the chosen axis.CIf L is conserved, decreasing I increases |ω| and increasing I decreases |ω|.DInternal torques can exchange angular momentum among parts without changing total system L.

Question 15

A second situation is observed: An off-axis external force can change both. Which concept is being applied?

AInternal torque transferBAngular vs linear conservationCNo external torque conditionDChanging rotational inertia

Question 16

Which relationship best represents this Topic 6.4 idea: Angular momentum conservation about a chosen axis?

AI_iω_i = I_fω_fBL_i = L_fCΔL = J_angular,extDNo quantitative relationship applies

Question 17

In Topic 6.4, which variable-and-unit description belongs with L_i = L_f?

AFor ΔL = J_angular,ext: kg·m²/sBFor I_iω_i = I_fω_f: I: kg·m²; ω: rad/sCFor L_i = L_f: kg·m²/sDAll quantities are unitless

Question 18

For Topic 6.4, consider this real application: I_iω_i=I_fω_f for a single reconfiguring rigid system. Which relationship supports that result?

AL_i = L_fBΔL = J_angular,extCI_iω_i = I_fω_fDOnly a verbal rule with no relationship

Question 19

Which relationship best represents this Topic 6.4 idea: Common skater/stool model with negligible external torque?

AΔL = J_angular,extBI_iω_i = I_fω_fCL_i = L_fDNo quantitative relationship applies

Question 20

In Topic 6.4, which variable-and-unit description belongs with I_iω_i = I_fω_f?

AFor L_i = L_f: kg·m²/sBFor ΔL = J_angular,ext: kg·m²/sCFor I_iω_i = I_fω_f: I: kg·m²; ω: rad/sDAll quantities are unitless

Question 21

For Topic 6.4, consider this real application: Halving I doubles ω. Which relationship supports that result?

AI_iω_i = I_fω_fBL_i = L_fCΔL = J_angular,extDOnly a verbal rule with no relationship

Question 22

Which relationship best represents this Topic 6.4 idea: General angular impulse statement?

AL_i = L_fBΔL = J_angular,extCI_iω_i = I_fω_fDNo quantitative relationship applies

Question 23

In Topic 6.4, which variable-and-unit description belongs with ΔL = J_angular,ext?

AFor I_iω_i = I_fω_f: I: kg·m²; ω: rad/sBFor L_i = L_f: kg·m²/sCFor ΔL = J_angular,ext: kg·m²/sDAll quantities are unitless

Question 24

For Topic 6.4, consider this real application: Zero external angular impulse gives conserved L. Which relationship supports that result?

AΔL = J_angular,extBI_iω_i = I_fω_fCL_i = L_fDOnly a verbal rule with no relationship

Question 25

In Topic 6.4, analyze this situation: A skater pulls arms inward. Which conclusion is most consistent with the physics?

AInternal friction redistributes angular momentum; final common ω follows total L conservation if external torque is negligible.BPlatform turns the other way so total angular momentum stays constant.CI decreases, so ω increases to preserve L.DThere is not enough information to use any Topic 6.4 idea

Question 26

Which Topic 6.4 worked example best illustrates this reasoning: “I decreases, so ω increases to preserve L”?

APerson/platformBSkaterCTwo disks coupleDNone of the listed physical situations

Question 27

A student is deciding how to begin the “Skater” situation. What is the best first move?

ASubstitute numbers before identifying the modelBIdentify the relevant Topic 6.4 concept/relationship and its assumptionsCIgnore units and directionsDUse every formula in the unit

Question 28

In Topic 6.4, analyze this situation: A spinning disk contacts a stationary disk coaxially. Which conclusion is most consistent with the physics?

APlatform turns the other way so total angular momentum stays constant.BI decreases, so ω increases to preserve L.CInternal friction redistributes angular momentum; final common ω follows total L conservation if external torque is negligible.DThere is not enough information to use any Topic 6.4 idea

Question 29

Which Topic 6.4 worked example best illustrates this reasoning: “Internal friction redistributes angular momentum; final common ω follows total L conservation if external torque is negligible”?

ASkaterBTwo disks coupleCPerson/platformDNone of the listed physical situations

Question 30

A student is deciding how to begin the “Two disks couple” situation. What is the best first move?

ASubstitute numbers before identifying the modelBIdentify the relevant Topic 6.4 concept/relationship and its assumptionsCIgnore units and directionsDUse every formula in the unit

Question 31

In Topic 6.4, analyze this situation: A person turns one way on a low-friction platform. Which conclusion is most consistent with the physics?

AI decreases, so ω increases to preserve L.BInternal friction redistributes angular momentum; final common ω follows total L conservation if external torque is negligible.CPlatform turns the other way so total angular momentum stays constant.DThere is not enough information to use any Topic 6.4 idea

Question 32

Which Topic 6.4 worked example best illustrates this reasoning: “Platform turns the other way so total angular momentum stays constant”?

ATwo disks coupleBPerson/platformCSkaterDNone of the listed physical situations

Question 33

A student is deciding how to begin the “Person/platform” situation. What is the best first move?

ASubstitute numbers before identifying the modelBIdentify the relevant Topic 6.4 concept/relationship and its assumptionsCIgnore units and directionsDUse every formula in the unit

Question 34

In Topic 6.4, a student claims: “Angular momentum is always conserved.” Which correction is best?

AThe claim is always correctBIt is conserved only when net external angular impulse about the chosen axis is zero/negligible.CThe claim becomes correct if all numbers are positiveDThe claim cannot be checked experimentally

Question 35

Which statement should replace this misconception in a Topic 6.4 solution: “Angular momentum is always conserved.”?

AIt is conserved only when net external angular impulse about the chosen axis is zero/negligible.BKeep the misconception because it is a definitionCIgnore the physical model and compare only unitsDThe opposite of the misconception is always numerically zero

Question 36

In Topic 6.4, a student claims: “Pulling arms inward creates angular momentum.” Which correction is best?

AThe claim is always correctBIt redistributes mass and changes I; L stays approximately constant.CThe claim becomes correct if all numbers are positiveDThe claim cannot be checked experimentally

Question 37

Which statement should replace this misconception in a Topic 6.4 solution: “Pulling arms inward creates angular momentum.”?

AIt redistributes mass and changes I; L stays approximately constant.BKeep the misconception because it is a definitionCIgnore the physical model and compare only unitsDThe opposite of the misconception is always numerically zero

Question 38

In Topic 6.4, a student claims: “Conservation means each part keeps its own L.” Which correction is best?

AThe claim is always correctBTotal system L is conserved; parts can exchange angular momentum.CThe claim becomes correct if all numbers are positiveDThe claim cannot be checked experimentally

Question 39

Which statement should replace this misconception in a Topic 6.4 solution: “Conservation means each part keeps its own L.”?

ATotal system L is conserved; parts can exchange angular momentum.BKeep the misconception because it is a definitionCIgnore the physical model and compare only unitsDThe opposite of the misconception is always numerically zero

Question 40

What should a student identify before calculating in Topic 6.4?

AOnly the final numerical answerBChoose a system and axis, identify external torques, and predict changes in angular speed when rotational inertia changes.COnly whether the quantity is positiveDEvery equation on the reference sheet

Question 41

Which statement best describes the AP Physics 1 scope for Topic 6.4?

AThe topic has no defined scopeBAlways state the axis and external-torque condition.CCalculus is required for every questionDOnly memorized numerical values are assessed

Question 42

Which study sequence best matches this Topic 6.4 lesson?

AFormula first → ignore meaning → memorize answerBDefinition → physical model → real examples → equation conditions → reasoning/practiceCPractice only → skip definitions and examplesDSearch a different page for every unfamiliar term before continuing

How much AP Physics 1 MCQ practice is available?

Choose the exact AP Physics 1 topic

Conservation of Angular Momentum Practice

A skater reduces rotational inertia from 6 to 2 kg·m² with negligible external torque. If initial angular speed is 2 rad/s, what is final angular speed?

An isolated rotating system doubles its rotational inertia. What happens to angular speed?

Which condition is required for conservation of total angular momentum about a chosen axis during an interval?

A skater pulls arms inward and spins faster. Which Topic 6.4 concept most directly explains this physical situation?

Which statement best defines Changing rotational inertia in Topic 6.4?

A second situation is observed: A student on a rotating stool extends weights and spins slower. Which concept is being applied?

Two disks touch and friction redistributes L. Which Topic 6.4 concept most directly explains this physical situation?

Which statement best defines Internal torque transfer in Topic 6.4?

A second situation is observed: A person twists relative to a platform causing opposite platform rotation. Which concept is being applied?

A support force through the axis can have zero torque about that axis. Which Topic 6.4 concept most directly explains this physical situation?

Which statement best defines Axis choice in Topic 6.4?

A second situation is observed: Gravity may create torque about one point but not another. Which concept is being applied?

A pivot force can change linear momentum while exerting zero torque about the pivot. Which Topic 6.4 concept most directly explains this physical situation?

Which statement best defines Angular vs linear conservation in Topic 6.4?

A second situation is observed: An off-axis external force can change both. Which concept is being applied?

Which relationship best represents this Topic 6.4 idea: Angular momentum conservation about a chosen axis?

In Topic 6.4, which variable-and-unit description belongs with L_i = L_f?

For Topic 6.4, consider this real application: I_iω_i=I_fω_f for a single reconfiguring rigid system. Which relationship supports that result?

Which relationship best represents this Topic 6.4 idea: Common skater/stool model with negligible external torque?

In Topic 6.4, which variable-and-unit description belongs with I_iω_i = I_fω_f?

For Topic 6.4, consider this real application: Halving I doubles ω. Which relationship supports that result?

Which relationship best represents this Topic 6.4 idea: General angular impulse statement?

In Topic 6.4, which variable-and-unit description belongs with ΔL = J_angular,ext?

For Topic 6.4, consider this real application: Zero external angular impulse gives conserved L. Which relationship supports that result?

In Topic 6.4, analyze this situation: A skater pulls arms inward. Which conclusion is most consistent with the physics?

Which Topic 6.4 worked example best illustrates this reasoning: “I decreases, so ω increases to preserve L”?

A student is deciding how to begin the “Skater” situation. What is the best first move?

In Topic 6.4, analyze this situation: A spinning disk contacts a stationary disk coaxially. Which conclusion is most consistent with the physics?

Which Topic 6.4 worked example best illustrates this reasoning: “Internal friction redistributes angular momentum; final common ω follows total L conservation if external torque is negligible”?

A student is deciding how to begin the “Two disks couple” situation. What is the best first move?

In Topic 6.4, analyze this situation: A person turns one way on a low-friction platform. Which conclusion is most consistent with the physics?

Which Topic 6.4 worked example best illustrates this reasoning: “Platform turns the other way so total angular momentum stays constant”?

A student is deciding how to begin the “Person/platform” situation. What is the best first move?

In Topic 6.4, a student claims: “Angular momentum is always conserved.” Which correction is best?

Which statement should replace this misconception in a Topic 6.4 solution: “Angular momentum is always conserved.”?

In Topic 6.4, a student claims: “Pulling arms inward creates angular momentum.” Which correction is best?

Which statement should replace this misconception in a Topic 6.4 solution: “Pulling arms inward creates angular momentum.”?

In Topic 6.4, a student claims: “Conservation means each part keeps its own L.” Which correction is best?

Which statement should replace this misconception in a Topic 6.4 solution: “Conservation means each part keeps its own L.”?

What should a student identify before calculating in Topic 6.4?

Which statement best describes the AP Physics 1 scope for Topic 6.4?

Which study sequence best matches this Topic 6.4 lesson?

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