Equations

Question 1

Weight

Answer 1

Weight=mass x gravitional field strength

Question 2

Work done

Answer 2

Work done= force x distance

Question 3

Force applied to a spring

Answer 3

Force applied to a spring= spring constantx extension

Question 4

Distance travelled

Answer 4

Distance travelled = speed x time

Question 5

Acceleration

Answer 5

Acceleration = change in velocity/ time taken

Question 6

Momentum

Answer 6

Momentum= mass x velocity

Question 7

Kinetic energy

Answer 7

Kinetic energy= 0.5 x mass x speed (squared)

Question 8

Gravitational potential energy

Answer 8

Gravitational potential energy = massx gravitational field strengthx height

Question 9

Power( energy transferred)

Answer 9

Power = energy transferred / time

Question 10

Power(work done)

Answer 10

Power = work done/time

Question 11

Efficiency(energy transferred )

Answer 11

Efficiency = useful output energy transfer/ total input energy transfer

Question 12

Efficiency(power)

Answer 12

Efficiency= useful power output/ total power input

Question 13

Wave speed

Answer 13

Wave speed= frequency x wavelength

Question 14

Charge flow

Answer 14

Charge flow = current x time

Question 15

Potential difference

Answer 15

Current x resistance

Question 16

Power(potential difference)

Answer 16

Potential difference x current

Question 17

Power(current)

Answer 17

Current squared x resistance

Question 18

Energy transferred ( power)

Answer 18

Power x time

Question 19

Energy transferred( charge flow)

Answer 19

Charge flow x potential difference

Question 20

Density

Answer 20

Mass/ volume