Formulae

Question 1

Force=

Answer 1

Mass x acceleration

Question 2

Acceleration=

Answer 2

Change In velocity / time taken

Question 3

Density =

Answer 3

Mass / volume

Question 4

Work done=

Answer 4

Force x distance moved in direction of force

Question 5

Energy transferred=

Answer 5

Work done

Question 6

Kinetic energy

Answer 6

1/2 x mass x speed*2

Question 7

Gravitational potential energy

Answer 7

Mass x g x height

Question 8

Efficiency

Answer 8

Useful energy output / total energy input

Question 9

Weight

Answer 9

Mass x gfs

Question 10

Pressure

Answer 10

Force / area

Question 11

Average speed=

Answer 11

Distance / time

Question 12

Charge

Answer 12

Current x time

Question 13

Voltage

Answer 13

Current x resistance

Question 14

Electrical power

Answer 14

Voltage x current

Question 15

Wave speed

Answer 15

Frequency x wavelength

Question 16

Refractive index

Answer 16

Sin(I) / sin(R)

Question 17

Sin(Critical Angle)

Answer 17

1 / refractive index

Question 18

Frequency

Answer 18

1 / time period

Question 19

Pressure difference

Answer 19

Height x density x g

Question 20

Energy

Answer 20

Power x time

Question 21

Moment =

Answer 21

Force x perpendicular distance from the pivot

Question 22

Momentum=

Answer 22

Mass x velocity

Question 23

Voltage =

Answer 23

Energy/charge

Question 24

Force=

Answer 24

Change in momentum/time taken

Question 25

Relationship between the pressure and kelvin temperature of a fixed mass of gas at constant volume

Answer 25

P1/T1 = P2/T2

Question 26

Relationship between input (primary) and output (secondary) voltages and the turns ratio on a transformer

Answer 26

Input (primary voltage/ output(secondary voltage = primary turns/secondary turns

Vp/Vs = Np/Ns

Question 27

Equation for 100% efficiency

Answer 27

Efficiency = output power/input power

Efficiency = Is x Vs / Ip x Vp