   Chapter 7.5, Problem 7.8QQ

Chapter
Section
Textbook Problem

A ball is falling toward the ground. Which of the following statements are false? (a) The force that the ball exerts on Earth is equal in magnitude to the force that Earth exerts on the ball, (b) The ball undergoes the same acceleration as Earth. (c) The magnitude of the force the Earth exerts on the ball is greater than the magnitude of the force the ball exerts on the Earth.

To determine
Which of the following statements are falls when a ball is falling towards the ground.

Explanation

According to the Newton’s gravitational law,

Fg=GmMr2

• G is the universal gravitational constant
• m is the mass of object
• M is the mass of earth
• r is the distance between the object and the Earth

Form the above equation, the magnitude of the force Earth exerts on the ball is equal to the magnitude of the force the ball exerts on the Earth. Thus, option (c) is false.

According to Newton’s second law of motion,

F=ma

• m is the mass of the object
• a is the acceleration of the object

The bal

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