P1.1.3 - Drag Forces and Friction Flashcards
When are drag forces useful?
Parachutes use air resistance (a drag force) to slow down a fall.
Rough surfaces have ______ friction.
more
When is friction a bad thing?
Friction that wears down a bike chain.
Carpet burns
What is friction?
A force that acts when two force against each other.
Friction causes grip.
Smooth surfaces have _______ friciton.
less
How can you reduce drag forces?
Have a streamlined shape.
Name the two drag forces.
Air resistance
Water resistance
How can you reduce friction between 2 surfaces?
Use lubrication e.g. oil
When is friction a good thing?
Friction between your shoe and road to allow you to walk.
Friction between bike/car brakes and the wheels to allow you to stop.