Friction and Gravity

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

• force

• friction

• static

• kinetic

Friction is a force that acts in an ____________direction of movement.

• similar

• opposite

• parallel

• west

How does friction affect speed?

• More friction decreases speed

• More friction increases speed

• Less friction decreases speed

• None of these

What does friction produce?

• Light

• Sound

• Heat

• Gravity

Tags

NGSS.MS-PS3-5

Which of these materials do you predict would have the MOST amount of friction?

• Metal

• Tile

• Sand paper

• Denim

Which of these is an example of undesirable effects of friction?

• Keeping our balance

• Forest fire

• Running on the street

• Writing on notebook

Rougher surfaces have ___________.

• greater friction

• less friction

• the same level of friction

• All these are correct

Which of the following is an example of friction that is helpful?

• Brakes used on a bike

• Tires from a car on the road

• Tread on the bottom of your shoes

• All examples are helpful

How can friction be reduced?

• Reduce the force acting between the two surfaces

• Reduce the roughness of the two surfaces coming in contact

• Use wax, grease or oil

• All of the above are ways of reducing friction

You use ___________ friction when you leave marks on paper with a pencil “lead”.

• Static friction

• Sliding friction

• Rolling friction

• A. None of these