BMST Newton's Laws of Motion 3

Question 1

A 5 kg object accelerates at 4 m/s². What net force is acting on it?

Accepted Answer

20 N

Answer

F = ma = 5 kg × 4 m/s² = 20 N.

Question 2

Friction is a force that opposes motion. In terms of Newton's laws, friction affects an object by:

Accepted Answer

Reducing the net force and thus acceleration

Answer

Friction acts opposite to motion, reducing net force, which by F = ma reduces acceleration.

Question 3

A ball rolling on a frictionless surface will:

Accepted Answer

Continue rolling at constant speed indefinitely

Answer

With no friction (no net force), Newton's First Law says the ball maintains constant velocity.

Question 4

When you press your hand against a wall, the wall presses back on your hand. This is an example of:

Accepted Answer

Newton's Third Law

Answer

Newton's Third Law: every action force has an equal and opposite reaction force.

Question 5

Which scenario best demonstrates Newton's Second Law?

Accepted Answer

A heavier cart accelerates less than a lighter one under the same force

Answer

F = ma shows that with equal force, greater mass produces less acceleration.

BMST - Basic Math and Science Test Practice Test