Main content

AP®︎/College Physics 1

Course: AP®︎/College Physics 1 > Unit 2

Lesson 2: Newton's third law and free body-diagrams

Newton's third law and free-body diagrams

AP.PHYS: INT‑3.A (EU), INT‑3.A.3 (EK), INT‑3.A.3.1 (LO), INT‑3.A.3.2 (LO), INT‑3.A.3.3 (LO), INT‑3.A.4 (EK), INT‑3.A.4.1 (LO), INT‑3.A.4.2 (LO)

Google Classroom

Two boxes of equal mass are pulled along a rough floor by the force F shown in the figure below. The boxes have a resulting acceleration of 2, point, 5, start text, m, slash, s, end text, squared to the right.

Which of the following statements correctly compares the forces box A and B exert on one another?

(Choice A)
The force exerted on box B by box A is larger because it must be added to the applied force F.
(Choice B)
The boxes exert the same size force on one another, because this is an action-reaction pair.
(Choice C)
The force exerted on box A by box B is smaller because box B is pulling only half the mass of the system.
(Choice D)
The force exerted on box A by box B is smaller because there is only one force acting on box A.

Stuck?

AP®︎/College Physics 1

Course: AP®︎/College Physics 1 > Unit 2

Problem