Exploring Friction

Exploring Friction

Friction

• Contact force that resists motion between two objects

• Friction force is always opposite in direction

Types of Friction

• Static - keeps objects at rest

• Kinetic - opposes/slows an object when moving

Multiple Choice

A baseball player slides into second base. Because of ____________, he slows down.

• Static Friction

• Kinetic Friction

Multiple Choice

Rub your hands together quickly. The surfaces of your hands sliding past one another is an example of ____________

• Static Friction

• Kinetic Friction

• Gravity

• Normal Force

Friction force releases energy as heat

Microscopic ridges on an object's surface and acting against frictional force generates heat.

Open Ended

What are some other examples of ridged surfaces?

Multiple Choice

Which type of friction describes the friction between skiis and snow?

• Gravitational Friction

• Normal Friction

• Static Friction

• Kinetic Friction

Multiple Choice

Which of the following scenarios describes an example of static friction?

• Leaves on trees bumping into each other

• A rock sitting on the road

• Walking to social studies class

• Pushing your chair in at the end of class

Fill in the Blanks

Multiple Choice

This frog stuck on the wall judging you.

• Static Friction

• Gravitational Pull

• Available Force

• Kinetic Friction

Open Ended

If you could hold this frog, what do you think his feet feel might feel like?

Multiple Choice

What type of friction describes the lick from a cat's tongue?

• Kinetic Friction

• Sticky Friction

• Static Friction

• Kitty Friction

Multiple Choice

How would the addition of rollers or wheels affect friction?

• Reduce it

• Eliminate it

• Increase it

• Nothing

Open Ended

You have been hired to create the fastest slip-n-slide ever for the beginning of summer party. What might you do so that your classmates can go as fast as possible?

Multiple Choice

"Oh no, I left the pan in the sink for three weeks. I'm really going to have to push hard with my scrubber to get this food off."

• Decrease Friction

• Increase Friction

• Eliminate Friction

• There is no friction force because of water

Multiple Choice

"I will add WD-40 to my closet door so when the ghost opens it, it doesn't squeak and wake me up."

• Decreasing Friction

• Increasing Friction

Multiple Choice

"The last time I swung a baseball bat, it flew out of my hands and went into the stands. I should add tape to the handle."

• Decreasing Friction

• Eliminating Friction

• Increasing Friction

• Defying Gravity

Multiple Choice

"It is sooooo icy! Good thing my mom bought me these for my walk to school!"

• I don't care if I fall and break my face, you wouldn't catch me dead wearing those

• Increasing Friction

• Decreasing Friction

Open Ended

How could you make this easier to move to the other side of the room?

Multiple Choice

When I replace my bald tires with new ones

• Increasing Force

• Decreasing Friction

• Increasing Friction

• Decreasing horsepower

Open Ended

Where is there friction occuring?

Open Ended

What friction keeps the truck parked on a hill from rolling away?

Open Ended

What is an example of kinetic friction occuring in your home?

Open Ended

What is an example of static friction in your home?