Physics Equations

Question 1

Weight

Answer 1

Mass x gravitational field strength

Question 2

Force applied to a spring

Answer 2

Spring constant x extension

Question 3

Acceleration

Answer 3

Change in velocity/time taken

Question 4

Gravitational potential energy

Answer 4

Mass x gravitational field strength x height

Question 5

Power measured in Watts

Answer 5

Work done/time
Energy transferred/time
Potential difference x current
Current^2 x resistance

Question 6

Efficiency

Answer 6

Useful power output/total power output

Useful output energy transfer/total input energy transfer

Question 7

Charge flow

Answer 7

Current x time

Question 8

Energy transferred

Answer 8

Power x time

Charge flow x potential difference (voltage)

Question 9

Density

Answer 9

Mass/volume

Question 10

Work done

Answer 10

Force x distance (along line of action of force)

Question 11

Distance travelled

Answer 11

Speed x time

Question 12

Resultant force

Answer 12

Mass x acceleration

Question 13

Kinetic energy

Answer 13

0.5 x mass x speed^2

Question 14

Wave speed

Answer 14

Frequency x wavelength

Question 15

Potential difference

Answer 15

Current x resistance

Question 16

Pressure

Answer 16

Force (to a surface)/area of surface

Question 17

Momentum of a force

Answer 17

Force x distance (normal to direction of force)

Question 18

Equation that links energy transferred to specific heat capacity

Answer 18

Change in thermal energy = mass x SHC x temperature change

Question 19

Elastic potential energy

Answer 19

0.5 x spring constant x extension^2

Question 20

Change in thermal energy

Answer 20

Mass x SHC x change in temp

Question 21

Total voltage in a series circuit

Answer 21

V1+V2+V3…..

Question 22

Current

Answer 22

Voltage/Resistance

Question 23

In a series circuit current is…

Answer 23

The same throughout - I1=I2=I3

Question 24

Total resistance in a series circuit

Answer 24

R1+R2+R3…..

Question 25

Voltage in a parallel circuit

Answer 25

V1=V2=V3.....

Question 26

Total current in a parallel circuit

Answer 26

I1+I2+I3.......

Question 27

Density

Answer 27

Mass/Volume

Question 28

Energy needed when a substance of mass changes state

Answer 28

E= Mass x specific latent heat

Question 29

Moment

Answer 29

Force x velocity

Question 30

Pressure at a depth

Answer 30

P = Height of the column of liquid x GFS x Density

Question 31

Uniform acceleration

Answer 31

final velocity - initial velocity = 2 x acceleration x distance

Question 32

Resultant force

Answer 32

Mass x acceleration

Question 33

Force (momentum)

Answer 33

F = change in momentum/change in time

Question 34

Period

Answer 34

1/frequency

Question 35

magnification

Answer 35

image height/object height

Question 36

Force (the motor effect)

Answer 36

F = magnetic flux density x current x length

Question 37

Transformer equation

Answer 37

Input potential difference/output potential difference = number of turns on primary coil/number of turns on secondary coil