Friction: An Intro

On which surface would a toy car travel the farthest, when it goes down a ramp?

• table top

• sandpaper

• cloth

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NGSS.MS-PS2-2

Which surface would have the most friction, when a toy car passes over it?

• table top

• sandpaper or cloth

• ice

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NGSS.MS-PS2-2

What is the force that opposes motion between two surfaces that are in contact?

• gravity

• net force

• friction

• balanced forces

The rougher the surface is the _________ the friction is.

• greater

• lesser

• equal

What are the two types of friction?

• kinetic and potential

• kinetic and gravitational

• static and potential

• kinetic and static

Which of the following is an example of sliding kinetic friction?

• a bowling ball

• writing with a pencil

• roller blading

• a bike wheel

Which of the following is an example of rolling kinetic friction?

• brakes on a bicycle

• writing with a pencil

• a bowling ball knocking down pins

• scratching an itch

When we pour sand on an icy road, what force are we increasing to help cars stay on the road?

• friction

• elecricity

• magnetism

• gravity

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NGSS.MS-PS2-2

How does friction affect speed?

• less friction decreases speed

• more friction increases speed

• more friction decreases speed

• 
  friction has no affect on speed

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NGSS.MS-PS2-2

What are 2 factors that determine the amount of friction between 2 objects?

• How smelly or not smelly the objects are

• 
  Force and roughness between surfaces

• The color and brightness of the objects

• Whether Grogu is using his levitation powers or not... May the Force be with you, always!

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NGSS.MS-PS2-5