Friction

Among the surface listed below, which can make a ball roll most easily ?

• Glass

• Carpet

• Cement

• Grass

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

• similar
• opposite
• parallel
• west

Rougher surfaces have ...

• more friction

• less friction

• the same level of friction

Which of the following affects the frictional force? (Tick 2 answers)

• The shape of an object

• The mass of an object

• The temperature of the surface

• The type of surface

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

• True
• False

When most objects with smooth surfaces rub, there is less friction.

• True
• False

On which surface will a toy car travel the furthest?

• Carpet surface

• Cement surface

• Glass surface

Why is person B having a hard time moving down the hill?

• Person B has more friction than person A.

• Person B has the same friction as person A.

• Person B is out of shape.

• Person B has less friction has person A.

Students roll toy cars down the same ramp with different coverings like carpet, foil, and sandpaper. What are they trying to test?

• How does the height of a ramp affect the distance a car will roll?

• How does the mass of the car affect the distance a car will roll?

• How does the surface of a ramp affect how fast a car will travel?

• How does the surface of a ramp affect the distance a car will roll?

What is friction?

• Force exist between two force

• Push and pull

• Energy that release when we apply two force between the surface.

• Friction is the force generated when two surfaces are in contact with each other