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.

Key facts

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 2.1 · 42 MCQs

Systems & Center of Mass 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.

Question 1

Two point masses, 1 kg at x = 0 m and 3 kg at x = 4 m, form one system. Where is the center of mass?

A3 mB2 mC4 mD1 m

Question 2

Two point masses, 2 kg at x = 0 m and 4 kg at x = 5 m, form one system. Where is the center of mass?

A3.33 mB2.5 mC6 mD1.67 m

Question 3

Two point masses, 3 kg at x = 0 m and 5 kg at x = 6 m, form one system. Where is the center of mass?

A3.75 mB3 mC8 mD2.25 m

Question 4

Two point masses, 4 kg at x = 0 m and 6 kg at x = 7 m, form one system. Where is the center of mass?

A4.2 mB3.5 mC10 mD2.8 m

Question 5

Two point masses, 5 kg at x = 0 m and 7 kg at x = 8 m, form one system. Where is the center of mass?

A4.67 mB4 mC12 mD3.33 m

Question 6

Two point masses, 6 kg at x = 0 m and 8 kg at x = 9 m, form one system. Where is the center of mass?

A5.14 mB4.5 mC14 mD3.86 m

Question 7

A 2 kg cart carries a 1 kg box. A student chooses cart + box as one system. Which force is internal to that chosen system?

AThe contact force of the cart on the boxBEarth’s gravitational force on the systemCThe floor’s normal force on the cartDA rope pulled by a person outside the system

Question 8

A 3 kg cart carries a 2 kg box. A student chooses cart + box as one system. Which force is internal to that chosen system?

AThe contact force of the cart on the boxBEarth’s gravitational force on the systemCThe floor’s normal force on the cartDA rope pulled by a person outside the system

Question 9

A 4 kg cart carries a 3 kg box. A student chooses cart + box as one system. Which force is internal to that chosen system?

AThe contact force of the cart on the boxBEarth’s gravitational force on the systemCThe floor’s normal force on the cartDA rope pulled by a person outside the system

Question 10

A 5 kg cart carries a 4 kg box. A student chooses cart + box as one system. Which force is internal to that chosen system?

AThe contact force of the cart on the boxBEarth’s gravitational force on the systemCThe floor’s normal force on the cartDA rope pulled by a person outside the system

Question 11

A 6 kg cart carries a 5 kg box. A student chooses cart + box as one system. Which force is internal to that chosen system?

AThe contact force of the cart on the boxBEarth’s gravitational force on the systemCThe floor’s normal force on the cartDA rope pulled by a person outside the system

Question 12

A 7 kg cart carries a 6 kg box. A student chooses cart + box as one system. Which force is internal to that chosen system?

AThe contact force of the cart on the boxBEarth’s gravitational force on the systemCThe floor’s normal force on the cartDA rope pulled by a person outside the system

Question 13

Two equal masses are placed at x = −2 m and x = +2 m. Where is their center of mass?

Ax = 0 mBx = −3 mCx = +3 mDIt cannot be located without knowing their speeds

Question 14

Two equal masses are placed at x = −3 m and x = +3 m. Where is their center of mass?

Ax = 0 mBx = −3 mCx = +3 mDIt cannot be located without knowing their speeds

Question 15

Two equal masses are placed at x = −4 m and x = +4 m. Where is their center of mass?

Ax = 0 mBx = −3 mCx = +3 mDIt cannot be located without knowing their speeds

Question 16

Two equal masses are placed at x = −5 m and x = +5 m. Where is their center of mass?

Ax = 0 mBx = −3 mCx = +3 mDIt cannot be located without knowing their speeds

Question 17

Two equal masses are placed at x = −6 m and x = +6 m. Where is their center of mass?

Ax = 0 mBx = −3 mCx = +3 mDIt cannot be located without knowing their speeds

Question 18

Two equal masses are placed at x = −7 m and x = +7 m. Where is their center of mass?

Ax = 0 mBx = −3 mCx = +3 mDIt cannot be located without knowing their speeds

Question 19

A 1 kg mass and a 5 kg mass are separated on a straight line. Which qualitative statement about their center of mass is correct?

AIt lies closer to the 5 kg massBIt lies closer to the 1 kg massCIt must lie exactly halfwayDIt lies outside the two masses

Question 20

A 2 kg mass and a 7 kg mass are separated on a straight line. Which qualitative statement about their center of mass is correct?

AIt lies closer to the 7 kg massBIt lies closer to the 2 kg massCIt must lie exactly halfwayDIt lies outside the two masses

Question 21

A 3 kg mass and a 9 kg mass are separated on a straight line. Which qualitative statement about their center of mass is correct?

AIt lies closer to the 9 kg massBIt lies closer to the 3 kg massCIt must lie exactly halfwayDIt lies outside the two masses

Question 22

A 4 kg mass and a 11 kg mass are separated on a straight line. Which qualitative statement about their center of mass is correct?

AIt lies closer to the 11 kg massBIt lies closer to the 4 kg massCIt must lie exactly halfwayDIt lies outside the two masses

Question 23

A 5 kg mass and a 13 kg mass are separated on a straight line. Which qualitative statement about their center of mass is correct?

AIt lies closer to the 13 kg massBIt lies closer to the 5 kg massCIt must lie exactly halfwayDIt lies outside the two masses

Question 24

A 6 kg mass and a 15 kg mass are separated on a straight line. Which qualitative statement about their center of mass is correct?

AIt lies closer to the 15 kg massBIt lies closer to the 6 kg massCIt must lie exactly halfwayDIt lies outside the two masses

Question 25

A firework explodes about 80 m above the ground. If air resistance is negligible during the short explosion, what happens to the motion of the center of mass of all fragments?

AIt continues according to the external gravitational forceBIt instantly stops because internal forces cancelCIt accelerates randomly because the fragments separateDIt moves toward the largest fragment

Question 26

A firework explodes about 100 m above the ground. If air resistance is negligible during the short explosion, what happens to the motion of the center of mass of all fragments?

Question 27

A firework explodes about 120 m above the ground. If air resistance is negligible during the short explosion, what happens to the motion of the center of mass of all fragments?

Question 28

A firework explodes about 140 m above the ground. If air resistance is negligible during the short explosion, what happens to the motion of the center of mass of all fragments?

Question 29

A firework explodes about 160 m above the ground. If air resistance is negligible during the short explosion, what happens to the motion of the center of mass of all fragments?

Question 30

A firework explodes about 180 m above the ground. If air resistance is negligible during the short explosion, what happens to the motion of the center of mass of all fragments?

Question 31

A rigid car travels along a long straight road at about 12 m/s. Which modeling choice is best for analyzing its translational motion?

ATreat the car as a single object located at its center of mass when internal details are irrelevantBTrack every molecule in the carCTreat the road and Earth as part of the car automaticallyDIgnore the car’s mass because it is moving

Question 32

A rigid car travels along a long straight road at about 16 m/s. Which modeling choice is best for analyzing its translational motion?

Question 33

A rigid car travels along a long straight road at about 20 m/s. Which modeling choice is best for analyzing its translational motion?

Question 34

A rigid car travels along a long straight road at about 24 m/s. Which modeling choice is best for analyzing its translational motion?

Question 35

A rigid car travels along a long straight road at about 28 m/s. Which modeling choice is best for analyzing its translational motion?

Question 36