Chapter 2 Test

Besides a strength, or magnitude, what does every force have?

• gravity

• direction

• friction

• magnetism

A ball is rolled across four different surfaces with the same force. Which surface will slow the movement of the ball the most?

• tile floor

• paved road

• grassy field

• cement sidewalk

How do electric and magnetic forces act on different objects?

• They only pull objects.

• They only push objects.

• They either push or pull objects.

• They only push or pull objects when they touch each other.

What happens when an object accelerates?

• Its speed or direction changes.

• Only its speed changes.

• Only its direction changes.

• Its speed and direction do not change.

When you ride a roller coaster, what makes your body rise out of its seat at the top of a hill?

• inertia

• gravity

• friction

• electricity

How can you complete this sentence so its always true?

The greater the net force acting on an object,

• the lesser the mass of the object.

• the grater the mass of the object.

• the lesser the acceleration of the object.

• the greater the acceleration of the object.

What always happens when the forces acting on an object are equal in strength and opposite in direction?

• The object moves.

• The motion of the object does not change.

• The object does not move.

• The object becomes heavier.

When the sun is low in the sky early in the morning, trees form

• no shadows.

• short shadows.

• long shadows.

• all sizes of shadows.