BMST - Basic Math and Science Newton's Laws of Motion Questions and Answers 5

Question 1

A 3 kg object and a 9 kg object are dropped from the same height in a vacuum. Which hits the ground first?

Accepted Answer

They hit at the same time

Answer

In a vacuum, all objects fall with the same gravitational acceleration regardless of mass.

Question 2

A 4 kg object requires a net force of 16 N to accelerate. If the mass is doubled to 8 kg with the same force, the new acceleration is:

Accepted Answer

2 m/s²

Answer

Original acceleration = 16/4 = 4 m/s²; doubling mass halves acceleration to 2 m/s².

Question 3

A skateboarder stands still on a skateboard and throws a ball forward. The skateboarder moves:

Accepted Answer

Backward

Answer

By Newton's Third Law, the reaction to throwing the ball forward pushes the skateboarder backward.

Question 4

What is the SI unit of force?

Accepted Answer

Newton (N)

Answer

The Newton (N) is the SI unit of force, equivalent to kg·m/s².

Question 5

A net force causes a 6 kg object to accelerate at 2 m/s². If the same force is applied to a 3 kg object, its acceleration would be:

Accepted Answer

4 m/s²

Answer

Force = 6×2 = 12 N; applied to 3 kg: a = 12/3 = 4 m/s².

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