Chapter 2: Forces and Motion

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

• gravity
• direction
• friction
• magnetism

What happens when an object accelerates?

• Its speed or direction changes.
• Only its speed changes.
• Only its direction changes.
• Its speed and direction fo not change.

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

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

• inertia
• gravity
• fricition
• electricity

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.

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 in the moring, trees form

• no shadows.
• short  shadows.
• long shadows.
• all sizes of shadows.

How many laws of motion were created by Sir Isaac Newton?

• 10
• 3
• 22
• 7

What is the 1st Law of Motion (the Law of Inertia)?

• For every action there is an equal and opposite reaction.
• An object will stay in uniform motion unless a force acts on the object.
• The acceleration of an object is dependent upon two variables--the net force and the mass.