Chapter 3.1, Problem 4R

To determine

The two forces that would change the motion of a bicycle travelling along a road.

Explanation of Solution

Introduction:

Force is a push or pull that can change the state or position of an object. Gravity and friction are the two forces that would change the motion between an object and the earth.

Gravity: Gravity is defined as a force that attracts an object or a body towards the center of the earth. It is also known as gravitational force. When a bicycle travels along a road, its motion can change if the road is on an incline or decline.

Friction: Friction is defined as force that acts between the two surfaces and it is generated when two surfaces slides over each other. When a bicycle travels over a rough surface, like going from pavement to gravel, or a road to a dirt surface, its motion changes.

Conclusion:

Gravity and friction are the two forces that would change the motion between an object and the earth.