Friction: static and kinetic

Front

In what way can friction be reduced?

Back

By adding a lubricant like oil

Front

Which of these is an example of sliding friction?

• a badminton shuttlecock flying over the net
• a basketball rolling across a wooden floor
• a flying kite pushed by a gentle breeze
• a hockey puck moving across the ice

Back

a hockey puck moving across the ice

Front

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

Back

opposite

Front

Factors affecting the amount of friction between two objects:

• type of surface & pressure applied to the surface
• distance between the objects
• mass of the objects
• temperature of the objects

Back

type of surface & pressure applied to the surface

Front

Example of friction that is harmful: Pencil marking on paper, sand placed on ice in the winter, engine parts wearing out, using an eraser to erase marks.

Back

Engine parts wearing out

Front

When most objects with smooth surfaces rub, there is __________friction.

Back

less

Front

What type of friction exists between the wheels of a train and the tracks?

Back

rolling friction

Front

Why does a flat piece of notebook paper take longer to reach the ground than an identical piece of notebook paper crumpled into a ball?

Back

The frictional force of air has more effect on the falling flat piece of paper.

Front

Why do swimmers wear a swim cap when competing in a race?

Back

To create a smooth surface & reduce friction

Front

Which is not a way to reduce friction? Options: Add more force, Add oil or another type of lubricant, Replace rolling with sliding, Smooth the surface

Back

Add more force