science test 2

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 it is always true?

The greater the net force acting on an object

• the lesser the mass of the object.

• the greater 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.

You are building a wooden car to enter in a downhill race. What can you do to make the car go as fast as possible?

• Make the car light with a box shape.

• Make the car heavy with a curved shape.

Describe a contact force and a non-contact force that affect the motion of a baseball after a pitcher has thrown the ball.

• Air is the non-contact gravity is the contact force

• Air is the contact force and gravity the is non-contact