P1.1.3 - Drag Forces and Friction Flashcards
1
Q
When are drag forces useful?
A
Parachutes use air resistance (a drag force) to slow down a fall.
2
Q
Rough surfaces have ______ friction.
A
more
3
Q
When is friction a bad thing?
A
Friction that wears down a bike chain.
Carpet burns
4
Q
What is friction?
A
A force that acts when two force against each other.
Friction causes grip.
5
Q
Smooth surfaces have _______ friciton.
A
less
6
Q
How can you reduce drag forces?
A
Have a streamlined shape.
7
Q
Name the two drag forces.
A
Air resistance
Water resistance
8
Q
How can you reduce friction between 2 surfaces?
A
Use lubrication e.g. oil
9
Q
When is friction a good thing?
A
Friction between your shoe and road to allow you to walk.
Friction between bike/car brakes and the wheels to allow you to stop.
