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4.3 Newton's Second Law of Motion: Concept of a System

1 2 3 4 5 6 7 8 9 10 11 12 13 14

4.4 Newton's Third Law of Motion: Symmetry in Forces

15 16

4.5 Normal, Tension, and Other Examples of Forces

17 18 19 20 21 22

4.6 Problem-Solving Strategies

23 24 25 26 27 28 29 30 31 32 33 34 35 38 39

4.7 Further Applications of Newton's Laws of Motion

40 41 42 43 44 45 46 47 48 49 50 51

4.8 Extended Topic: The Four Basic Forces—An Introduction

52 53 54

Test Prep for AP® Courses

4.1 Development of Force Concept

1 2 3 4

4.4 Newton's Third Law of Motion: Symmetry in Forces

5 6 7 8 9 10 11 12 13 14 15

4.5 Normal, Tension, and Other Examples of Forces

16 17 18 19 20 21 22

4.6 Problem-Solving Strategies

23 24 25

4.7 Further Applications of Newton's Laws of Motion

26 27 28

4.8 Extended Topic: The Four Basic Forces—An Introduction

29 30 31 32 33 34

Problem6

Section 4.4: Newton's Third Law of Motion: Symmetry in Forces (Test prep for AP® courses)

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Question

A ball with a mass of 0.25 kg hits a gym ceiling with a force of 78.0 N. What happens next? (a) The ball accelerates downward with a force of 80.5 N.
(b) The ball accelerates downward with a force of 78.0 N.
(c) The ball accelerates downward with a force of 2.45 N.
(d) It depends on the height of the ceiling.

Question by OpenStax is licensed under CC BY 4.0

Final Answer

(a)

Solution video

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Comments

ShaunDychko· Nov 22, 2023

This video was updated on Nov. 22nd, 2023

kampei· Oct 31, 2021

wouldn't the net force of acting on the ball be (mg) + the third law reaction? Why is the answer not (a)?

ShaunDychko· Nov 1, 2021

Hi kampei, Thank you very much for this great comment - you're quite right! I have updated the final answer with this correction and some explanation. All the best, Shaun