Flashcards in Equations to know Deck (23):

1

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How do you work out:

Weight

(W=mg)

###
Weight= mass x gravitational field strength

2

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How do you work out:

Force applied to a spring

(K=ke)

### Force applied to a string= spring constant x extention

3

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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

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How do you work out:

Gravitational potential energy (GPE)

(Ep=mgh)

### GPE= mass x gravitational field strength x height

6

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How do you work out:

Power

(P=W/h)

### Power= work done / time

7

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How do you work out:

Efficiency

(Hint: Power)

### Efficiency= useful out / total out (power)

8

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How do you work out:

Charge flow

(Q=I t)

### Charge flow= current x time

9

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How do you work out:

Power

(P=VI)

### Power= potential difference x current

10

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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

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How do you work out:

Work done

(W=Fs)

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

13

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How do you work out:

Distance travelled

(s=vt)

### Distance traveled= speed x time

14

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How do you work out:

Resultant force

(F=ma)

### Resultant force= mass x acceleration

15

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How do you work out:

Kinetic energy

(Ek= 0.5mv(squared))

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

16

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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

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How do you work out:

Potential difference

(V=IR)

### Potential difference= current x resistance

19

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How do you work out:

Efficiency

(Energy transfer)

### Efficiency= useful output energy transfer/useful input energy transfer

20

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How do you work out:

Power

(P=I(squared) R)

### Power= current(squared) x resistance

21

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How do you work out:

Energy transferred

(E= QV)

### Energy transferred= charge flow x potential difference

22

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How do you work out:

Pressure

(p= F/A)

### Pressure= force to normal surface/area of surface

23