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

Gravity

Answer

Applied force

Answer

Normal force

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

Equal and opposite force

Answer

Gravitational force only

Answer

Frictional force

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

0.5 m/s²

Answer

10 m/s²

Answer

200 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

First Law

Answer

Second Law

Answer

Law of Gravitation

Question 5

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

Accepted Answer

Newton (N)

Answer

Kilogram (kg)

Answer

Meter per second (m/s)

Answer

Joule (J)

Question 6

Two forces of 15 N and 10 N act in the same direction on an object. What is the net force?

Accepted Answer

25 N

Answer

5 N

Answer

10 N

Answer

15 N

Question 7

A car traveling at a constant speed on a straight road has forces that are:

Accepted Answer

Balanced, with a net force of zero

Answer

Unbalanced, with a net forward force

Answer

Only gravitational forces acting

Answer

Only frictional forces acting