Forces Flashcards
1
Q
Static/at rest/constant speed/on the point of slipping
A
Forces are balanced horizontally and vertically
2
Q
Force =
A
mass x acceleration
3
Q
What does friction always oppose?
A
The direction of motion/it will move in
4
Q
Friction if static
A
F<= uR
5
Q
Friction in limiting equlibrium
A
F = uR
6
Q
What is the coefficient of friction between?
A
0 and 4 ish
7
Q
Connected particles method
A
Use F = ma
Make simultaneous equations
Use suvat to find after string breaks
New acceleration, t = 0
Use SUVAT again with new a
8
Q
Moments =
A
force x perp distance OR perp force x distance
9
Q
Moments method
A
Resolve up down
Resolve left right
Take moments about A
10
Q
On the point of tilting about A meaning
A
RB = 0
