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AP®︎ Physics 1: Topic 2.3 Practice Test

Prepare for your quiz, test, or the AP exam with focused practice questions on Topic 2.3 of AP Physics 1 – Newton’s Third Law.

Questions List

Topic 2.3

Q10

Q11

Q12

Q13

Q14

Q15

Q16

Question 1 Easy

Block A, of mass

2.0\,\text{kg}

, and block B, of mass

6.0\,\text{kg}

, touch on a horizontal surface, with A to the left of B. At one instant, block A exerts a force of

30\,\text{N}

in the

+x

-direction on block B.

What is the force exerted by block B on block A at that instant?

30\,\text{N}

in the

+x

-direction

30\,\text{N}

in the

-x

-direction

90\,\text{N}

in the

-x

-direction

0\,\text{N}

What You’re Being Tested On:

Explore the learning objectives taken directly from the College Board’s AP® Physics 1 Curriculum. Ensure you’re prepared for the exact topics covered on the AP® exam, in-class tests, and quizzes, and gain confidence in your mastery of the material.

Topic 2.3: Newton’s Third Law

Boundary Statements official exam scope notes

AP Physics 1 only expects students to describe tension qualitatively in a string, cable, chain, or similar system with mass. For example, students might note that the tension in a hanging chain is greater toward the top of the chain.
The interaction between objects or systems at a distance is limited to gravitational forces in AP Physics 1. In AP Physics 2, gravitational, electric, and magnetic forces may be considered.

Learning Objective: 2.3.A

Describe the interaction of two objects using Newton’s third law and a representation of paired forces exerted on each object.

Essential Knowledge: 2.3.A.1

Newton’s third law describes the interaction of two objects in terms of the paired forces that each exerts on the other. $\vec{F}_{A\ \text{on}\ B} = -\vec{F}_{B\ \text{on}\ A}$

Essential Knowledge: 2.3.A.2

Interactions between objects within a system (internal forces) do not influence the motion of a system’s center of mass.

Essential Knowledge: 2.3.A.3

Tension is the macroscopic net result of forces that segments of a string, cable, chain, or similar system exert on each other in response to an external force.

Essential Knowledge: 2.3.A.3.i

An ideal string has negligible mass and does not stretch when under tension.

Essential Knowledge: 2.3.A.3.ii

The tension in an ideal string is the same at all points within the string.

Essential Knowledge: 2.3.A.3.iii

In a string with nonnegligible mass, tension may not be the same at all points within the string.

Essential Knowledge: 2.3.A.3.iv

An ideal pulley is a pulley that has negligible mass and rotates about an axle through its center of mass with negligible friction.

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AP®︎ Physics 1: Topic 2.3 Practice Test

Question 1 Easy

What You’re Being Tested On:

Learning Objective 2.3.A: 2.3.A.1, 2.3.A.2, 2.3.A.3, 2.3.A.3.i, 2.3.A.3.ii, 2.3.A.3.iii, 2.3.A.3.iv