PAPER 2 EQUATIONS Flashcards
1
Q
efficiency=
A
- useful energy output/ total energy input x100
- useful power output/ total power input x100
2
Q
moment of a force=
A
- force x distance (normal to direction of force)
- M=Fd
3
Q
pressure=
A
- force normal to a surface/ area of a surface
- p=F/A
4
Q
momentum=
A
- mass x velocity
- p=mv
5
Q
wave speed=
A
- frequency x wavelength
- v=fʎ
6
Q
resultant force=
A
- mass x acceleration
- F=ma
7
Q
weight=
A
- mass x gravitational field strength (g)
- W=mg
8
Q
force applied to a spring=
A
- extension x spring constant
- F=ek
9
Q
acceleration=
A
- change in velocity/ time taken
- a=△v/ t
- or a= (v-u)/t
10
Q
distance travelled=
A
- speed x time
- s=vt
11
Q
work done=
A
- force x distance moved (along the line of action of the force)
- W=Fs
12
Q
wave period
A
- T= 1/f
- f= frequency
