Equations

Question 1

weight

Answer 1

weight = mass x gravitational field strength

Question 2

work done

Answer 2

work done = force x distance

Question 3

force applied to a string

Answer 3

force applied to a string = spring constant x extension

Question 4

moment of a force

Answer 4

moment of a force = force x distance

Question 5

pressure

Answer 5

pressure = force / area

Question 6

distance

Answer 6

distance = speed x time

Question 7

acceleration

Answer 7

acceleration = change in velocity / time

Question 8

resultant force

Answer 8

resultant force = mass x acceleration

Question 9

momentum

Answer 9

momentum = mass x velocity

Question 10

kinetic energy

Answer 10

kinetic energy = 0.5 x mass x (speed)^2

Question 11

gravitational potential energy

Answer 11

gravitational potential energy = mass x gravitational field strength

Question 12

power

Answer 12

power = energy transferred / time

power = work done / time

power = potential difference x current

power = (current)|^2 x resistance

Question 13

efficiency

Answer 13

efficiency = useful energy output transfer / total input energy transfer

efficiency = useful power output / total power input

Question 14

wave speed

Answer 14

wave speed = frequency x wavelength

Question 15

charge flow

Answer 15

charge flow = current x time

Question 16

potential difference

Answer 16

potential difference = current x resistance

Question 17

energy transferred

Answer 17

energy transferred = power x time

energy transferred = charge flow x potential difference

Question 18

density

Answer 18

density = mass / volume

Question 19

density

Answer 19

density = mass / volume