Acts on object that are not moving

• static friction

• sliding friction

• rolling friction

• fluid friction

Force that opposes motion of an object as it slides over a surface

• static friction

• sliding friction

• rolling friction

• fluid friction

The force that acts in the opposite direction of motion when two surfaces come in contact. 

• Force
• Friction
• Static
• Kinetic 

What is gravity?

• A resistance to change. 
• A force that attracts and repels objects.
• A force that pulls objects "in" or together.
• A force that causes objects in motion to stay in motion. 

Define acceleration due to gravity.

• The force of gravity acting on an object.

• The velocity of an object under the influence of gravity.

• The acceleration experienced by an object due to gravity.

• The force of gravity.

Acceleration is defined as the CHANGE in 

• time of motion to another place. 
• velocity 
• distance 
• speed

Air resistance always acts in the _________direction of the moving object.

• same

• opposite

When an object is falling, and it reaches it's maximum speed because air resistance is equal to the force of gravity, the object has reached __________________________.

• Free Fall
• Terminal Velocity
• Projectile Motion
• Orbit

What force causes objects falling near Earth's surface to slow down?

• Gravity
• Air Resistance
• Centripetal Force
• Newtons

What is the definition of "weight"?

• measure of the force of gravity on your body
• the time it takes to get on a ride 
• the amount of matter in an object
• the size of an object