Friction

Which definition fits friction best?

• The resistance force slowing down objects as they move through the air.

• The driving force that moves objects in a particular direction.

• The pushing force that acts on an object in water to make it float.

• The contact force acting between two objects sliding past each other.

If there is more friction, objects will move...

• faster

• slower

• sideways

• up & down

How can we increase the friction between two objects?

• Make the contact surface rougher

• Make the contact surface smoother

• Make the contact surface a darker colour

• Make the contact surface a lighter colour

The rougher the surface, the ____ friction there is.

• More

• Less

When 2 smooth surfaces rub together, there is more friction.

• True

• False

Friction acts in the _________ direction to the direction of travel.

• Parallel

• Same

• Opposite

• Perpendicular

Which of the following is NOT an example of friction?

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If I push a Hot Wheels car with the same force each time, which material will it travel the furthest on before friction stops it?

• Ice

• Wood

• Carpet

• Leather

Why do the curling stones stop?

• They run out of the thrust force of being thrown so come to a stop.

• Slightly melted ice refreezes & sticks to the stones to make them stop.

• The friction between the ice and stones slow the stone's movement until they stop.

• Magnets are embedded in the ice which attract the metal on the handles causing the stones to stop.

Which of the following is NOT an example of helpful friction?

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