Physics: Motion & Forces

Question 1

What is the SI unit of force?

A Joule B Watt C Newton D Pascal

💡 Explanation

Newton is correct because force is measured in newtons (N) in the SI system.

Question 2

Which law states that for every action there is an equal and opposite reaction?

A Newton's First Law B Newton's Second Law C Newton's Third Law D Law of Gravity

💡 Explanation

Newton's Third Law is correct because it describes equal and opposite action-reaction forces.

Question 3

Acceleration is defined as the rate of change of:

A Distance B Velocity C Mass D Force

💡 Explanation

Velocity is correct because acceleration measures how velocity changes over time.

Question 4

What is the approximate acceleration due to gravity on Earth?

A 5 m/s² B 9.8 m/s² C 15 m/s² D 20 m/s²

💡 Explanation

9.8 m/s² is correct because that is the standard gravitational acceleration near Earth's surface.

Question 5

Speed in a given direction is known as:

A Acceleration B Velocity C Force D Momentum

💡 Explanation

Velocity is correct because it is speed combined with direction, making it a vector quantity.