BMST - Basic Math and Science Newton's Laws of Motion Questions and Answers 3

Question 1

A 5 kg box is pushed with a net force of 20 N. What is its acceleration?

Accepted Answer

4 m/s²

Answer

By Newton's Second Law, a = F/m = 20/5 = 4 m/s².

Question 2

Which of Newton's laws explains why a rocket accelerates when it expels gas?

Accepted Answer

Third Law

Answer

The rocket expels gas backward (action) and is pushed forward (reaction), illustrating Newton's Third Law.

Question 3

A car traveling at 30 m/s comes to a sudden stop. A passenger continues to move forward. This is best explained by:

Accepted Answer

Newton's First Law

Answer

Newton's First Law states an object in motion stays in motion unless acted upon by an external force.

Question 4

Two objects, one with mass 2 kg and one with mass 8 kg, experience the same net force. Which has the greater acceleration?

Accepted Answer

The 2 kg object

Answer

Since a = F/m, the smaller mass (2 kg) produces a greater acceleration for the same force.

Question 5

A person pushes a wall with 50 N of force. According to Newton's Third Law, the wall pushes back with:

Accepted Answer

50 N

Answer

Newton's Third Law states action and reaction forces are equal in magnitude but opposite in direction.

BMST - Basic Math and Science Test Practice Test