BMST Newton's Laws of Motion 4

Question 1

Inertia is defined as:

Accepted Answer

The tendency of an object to resist changes in its state of motion

Answer

Inertia is an object's resistance to changes in motion, and it is proportional to the object's mass.

Question 2

A car of mass 1,000 kg accelerates from rest to 20 m/s in 10 seconds. What is the net force on the car?

Accepted Answer

2,000 N

Answer

a = Δv/t = 20/10 = 2 m/s²; F = ma = 1000 × 2 = 2,000 N.

Question 3

If you exert a force on a skateboard and it accelerates at 2 m/s², but a heavier skateboard with the same force accelerates at 1 m/s², what does this tell you?

Accepted Answer

Acceleration decreases as mass increases

Answer

Newton's Second Law shows that for constant force, greater mass results in less acceleration (inverse relationship).

Question 4

Which best describes the action-reaction pair when a bat hits a baseball?

Accepted Answer

The bat exerts force on the ball; the ball exerts an equal and opposite force on the bat

Answer

Newton's Third Law: the bat and ball exert equal and opposite forces on each other.

Question 5

A spacecraft traveling in deep space (no gravity, no air resistance) turns off its engines. What happens?

Accepted Answer

It continues at constant velocity

Answer

With no net force, Newton's First Law says the spacecraft continues at constant velocity.

BMST - Basic Math and Science Test Practice Test

BMST - Basic Math and Science Test Practice Test

BMST Newton's Laws of Motion 4