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Flashcards in Equations to know Deck (23):
1

How do you work out:
Weight
(W=mg)

Weight= mass x gravitational field strength




2

How do you work out:
Force applied to a spring
(K=ke)

Force applied to a string= spring constant x extention

3

How do you work out: Acceleration
(a=▪️v/t)

Acceleration= change in velocity / time taken


(Divide)

4

How do you work out:
Momentum
(p=mv)

Momentum= mass x velocity

5

How do you work out:
Gravitational potential energy (GPE)
(Ep=mgh)

GPE= mass x gravitational field strength x height

6

How do you work out:
Power
(P=W/h)

Power= work done / time

7

How do you work out:
Efficiency
(Hint: Power)

Efficiency= useful out / total out (power)

8

How do you work out:
Charge flow
(Q=I t)

Charge flow= current x time

9

How do you work out:
Power
(P=VI)

Power= potential difference x current

10

How do you work out:
Energy transfer
(E=Pt)

Energy transfer= power x time

11

How do you work out:
Density
(p=m/V)

Density= mass/volume

12

How do you work out:
Work done
(W=Fs)

Work done= force x distance(along line of action of the force)

13

How do you work out:
Distance travelled
(s=vt)

Distance traveled= speed x time

14

How do you work out:
Resultant force
(F=ma)

Resultant force= mass x acceleration

15

How do you work out:
Kinetic energy
(Ek= 0.5mv(squared))

Kinetic energy= 0.5 x mass x (speed(squared))

16

How do you work out: Power
(P=E/t)

Power= energy transferred / time

17

How do you work out:
Wave speed
(v=f(upside down y))

Wave speed= frequency x wavelength

18

How do you work out:
Potential difference
(V=IR)

Potential difference= current x resistance

19

How do you work out:
Efficiency
(Energy transfer)

Efficiency= useful output energy transfer/useful input energy transfer

20

How do you work out:
Power
(P=I(squared) R)

Power= current(squared) x resistance

21

How do you work out:
Energy transferred
(E= QV)

Energy transferred= charge flow x potential difference

22

How do you work out:
Pressure
(p= F/A)

Pressure= force to normal surface/area of surface

23

How do you work out:
Momentum of force
(M=Fd)

Momentum of force= force x distance(normal to direction of force)