Stemscopes Exam STEMscopes Forces and Motion

Question 1

A soccer ball is rolling across a flat field and gradually slows to a stop. Which force is primarily responsible for slowing the ball?

Accepted Answer

Friction

Answer

Friction between the ball and the ground surface opposes the ball's motion and causes it to slow down and stop.

Question 2

According to Newton's First Law of Motion, an object at rest will remain at rest unless acted upon by a(n):

Accepted Answer

Unbalanced (net) force

Answer

Newton's First Law states that an object maintains its state of rest or uniform motion unless an unbalanced (net) external force acts on it.

Question 3

A student pushes a 10 kg box with a net force of 20 N. What is the acceleration of the box?

Accepted Answer

2 m/s²

Answer

Using Newton's Second Law (F = ma), acceleration = F/m = 20 N ÷ 10 kg = 2 m/s².

Question 4

When a swimmer pushes off the pool wall, they move forward. This is an example of Newton's:

Accepted Answer

Third Law

Answer

Newton's Third Law states that for every action there is an equal and opposite reaction; the swimmer pushes the wall (action) and the wall pushes the swimmer forward (reaction).

Question 5

Which of the following is the best unit for measuring force in the SI system?

Accepted Answer

Newton (N)

Answer

The Newton (N) is the SI unit of force, defined as the force needed to accelerate 1 kg at 1 m/s².

Stemscopes Exam Practice Test

Stemscopes Exam Practice Test

Stemscopes Exam STEMscopes Forces and Motion