Friction Middle School

Which of these pictures has useful frictional force?

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Tags

NGSS.MS-PS2-2

This type of force resist motion between two surfaces that are pressed together.

• Contact

• Gravity

• Friction

• Joint

Which type of friction is shown in the picture?

• Rolling Friction

• Fluid Friction

• Static Friction

• Sliding Friction

You can move heavy boxes by sliding them over the ground, or you can put them on a dolly and then roll them over the ground. Which way makes it easier to move the boxes? Why?

• Sliding the boxes on the floor is easier than using the dolly because rolling friction is less than sliding friction

• Sliding the boxes on the floor is easier than using the dolly because sliding friction is less than rolling friction.

• Rolling the boxes over the floor on the dolly is easier because sliding friction is less than rolling friction.

• Rolling the boxes over the floor on the dolly is easier because rolling friction is less than sliding friction.

Tags

NGSS.MS-PS3-5

The weakest type of friction that occurs between solid surfaces is _____ friction.

• sliding friction

• rolling friction

• static friction

• None of the above

When you put on the brakes of your bike, the wheels stop turning. Then friction between the wheels and the road slows your bike to a stop. Which type of friction is this?

• static friction.

• sliding friction.

• rolling friction.

• all of the above

The friction force acts in the ___________ direction of movement.

• same

• opposite

• straight

• adjacent

The roughness of the soles of our feet or shoes makes it possible for us to ____________________

• stand straight

• walk without slipping

• skip well

• sweat while walking

What type of friction is not moving?

• static
• sliding
• fluid
• rolling

Rougher surfaces have ____________

• greater friction

• less friction

• the same level of friction

• opposite friction