Question 1

What is the primary physical property of an object that determines its inertia?

Accepted Answer

Mass. Mass is the quantitative measure of an object's inertia. A larger mass results in greater resistance to changes in its state of motion. Inertia is an inherent property of matter that does not depend on gravity.

Question 2

Which law states that an object at rest will remain at rest unless acted upon by an external force?

Accepted Answer

Newton's First Law. Newton's First Law defines the concept of inertia and the necessity of force for motion change. It describes the behavior of objects in the absence of a net external force. This law is also frequently referred to as the Law of Inertia.

Question 3

In the formula F = ma, what does the 'a' represent?

Accepted Answer

Acceleration. The 'a' in the second law equation represents the acceleration produced by the net force. It indicates the rate at which the velocity of the object changes over time. Acceleration is directly proportional to force and inversely proportional to mass.

Question 4

When a bus starts suddenly, passengers tend to fall backwards due to which phenomenon?

Accepted Answer

Inertia of Rest. Inertia of rest causes the upper body to remain stationary while the lower body moves with the bus. This occurs because the body resists the sudden change from a state of rest. This is a classic everyday example of Newton's First Law.

Question 5

Newton's Third Law of Motion involves how many distinct bodies?

Accepted Answer

Two. Newton's Third Law always involves an interaction between two different bodies. When body A exerts a force on body B, body B exerts an equal force on body A. These action and reaction forces never act on the same object.

Newton's Laws — Set 1