FORCE, FRICTION, AND GRAVITY

Let us review

What is Force?

Force is a push or a pull

FrictionWhen two objects rub against each other

Examples of friction

Treads of a wheel

Soles of shoes

What causes friction?

Where is Friction?

Rough surface means more frictionMore friction means slower things

How hard objects press against each other

The harder objects press against each otherThe greater the friction

Same with this vehicle

Reducing friction

Lessen friction to make thing move fast

Reducing friction

Lessen friction to reduce heat

Increasing friction

Increase friction to produce heat

Increasing friction

Increase friction to produce heat

Match Lighter

Increasing friction

Increase friction to make things safe

Friction in the air

Which is faster?

Bus

Racing car

Friction in the air

More friction because of its face

Friction in the air

Less friction because of its design

Review

Tell me whetherThe following shows

MORE FRICTIONOr

LESS FRICTION

MORE FRICTION or LESS FRICTION

What Gravity?