Friction & Gravity

What is friction?

• the movement of objects over time

• the speeding up of motion when an object slides on a slippery floor

• the resistance of motion when one objects moves in the opposite direction of another

There are four types of friction. What are those four called?

• sliding, rolling, static, and fluid

• slipping, sliding, falling, and fluid

• slipping, sliding, static, and flowing

What type of friction will you have when two objects slide against each other?

• Sliding

• Rolling

• Static

• Fluid

What type of friction will you see when two objects roll across each other?

• Static

• Sliding

• Fluid

• Rolling

What type of friction will slow down the rolling soccer ball?

• Fluid

• Sliding

• Rolling

• Static

 What is the unit called that measures force?

• weight
• meter
• Newton
• kilogram

What does friction produce?

• light
• sound
• heat
• gravity

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

• Force
• Friction
• Static
• Kinetic 

What direction does friction act relative to motion?

• in the same direction
• in the opposite direction 
• need more information
• depends on the force

True or False: objects that are smooth have LESS friction than objects that are rough

• TRUE

• FALSE