Friction - Grade 3

Friction - Grade 3

by Dwi Febriana

What is Friction?

​Friction is a force* that slows things down.

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When two surfaces come in contact with one another, there is a frictional force. The amount of friction depends on a number of factors.

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Rougher surfaces create more friction than smooth surfaces. It is a lot easier to ride a bike on a newly paved road than on a dirt trail. The weight of an object pushing on the surface causes friction. The amount of surface in contact with another surface also affects the amount of friction. For example, wheels reduce the amount of surface contact.

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​Friction between solid surfaces can be increased and decreased.

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​In which way?

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​Friction is increased when more pressure  is applied to the surfaces and when the  materials/surfaces used are more rough.

​Friction also occurs when a body passes through a liquid or gas

Multiple Choice

Which of these best describes friction?

• A rubbing force.

• Something that is slippery.

• Gravity.

• Movement across a smooth surface.

Multiple Choice

What does friction produce?

• light

• sound

• heat

• gravity

Multiple Choice

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

• Metal

• Tile

• Sand Paper

• Denim

Multiple Choice

How does friction affect speed?

• more friction decreases speed

• more friction increases speed

• less friction decreases speed

Multiple Choice

The rougher the surface, the faster an object will travel over the surface.

• True

• False

Multiple Choice

Friction is a force that acts in an ___________ direction of movement.

• similar

• opposite

• parallel

• west

Multiple Choice

A puck slides along an icy surface. What makes it slow down?

• It runs out of push

• It rubs against the ice

• It runs out of electricity

Multiple Choice

Rougher surfaces have ...

• greater friction

• less friction

• the same level of friction

Multiple Choice

The amount of friction depends on how hard objects are pressing together.

• True

• False

Multiple Choice

Rougher surfaces have ...

• greater friction

• less friction

• the same level of friction

Multiple Choice

What type of friction is not moving?

• static

• sliding

• fluid

• rolling

Multiple Choice

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 are examples that are helpful

Multiple Choice

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

• Pencil marking on paper

• Engine parts wearing out

• sand placed on ice in the winter

• Using an eraser to erase marks