knowledge organizer revision 19-27 drag and friction Flashcards
1
Q
what 3 things can force do
A
- change an objects speed
- change an objects direction
- change an objects shape/size
2
Q
what is drag
A
- friction
- air resistance
- water resistance
3
Q
where does the energy go when friction acts on a body
A
energy is lost to the surroundings as heat
4
Q
how can we reduce friction
A
use lubrication or ball bearings
5
Q
what does friction depend on
A
the weight of the object , the roughness of the surfaces and connecting surface area
6
Q
what is streamlining
A
where we decrease the surface of a body to reduce drag forces
7
Q
what is extension of a spring
A
the difference between its natural length and the extended length
8
Q
what is hookes law
A
describes how springs etc extend when a force is applied
9
Q
what is the spring constant
A
measured in N/m describes how much a spring extends or compresses. a higher value means it will extend less under force
