Chapter 4.1, Problem 12SSC

To determine

To Identify: Mass, inertia, the push of a hand, friction, air resistance, spring force, gravity and acceleration as a, b or c.

1. Contact force
2. A field force
3. Not a force.

Explanation of Solution

Introduction:

Force is an external agent that causes change in shape or position of a body on which it is applied.

Contact force is the force which acts when the bodies are in contact with each other.

Field force acts on those bodies which are not in contact with each other.

Mass is not a force. So,it is in category c .

Inertia is not a force. So.it lies in category c.

The push of a hand is a contact force as the hand and the bodies to be pushed are in contact with each other. So.it follows category a.

Air resistance is a contact force. So, it lies in category a.

Spring force in a contact force. So, it also lies in category a.

Gravity is non-contact force. So, it lies in category b as it is a field force.

Acceleration is not a force. So, it lies in category c.

Conclusion:

Therefore, themass is in category c, inertia is in category c, the push of a hand is in category a, friction is in category a, air resistance is in category a, spring force is in category a, gravity is in category b and acceleration is in category c.