Physics Equations

Question 1

W = m g

Answer 1

weight = mass x gravitational field strength (g)

Question 2

W = F s

Answer 2

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

Question 3

F = k e

Answer 3

force applied to a spring = spring constant x extension

Question 4

s = v t

Answer 4

distance travelled = speed x time

Question 5

a = Δv/t

Answer 5

acceleration = change in velocity/time taken

Question 6

F = m a

Answer 6

resultant force = mass x acceleration

Question 7

p = m v

Answer 7

momentum = mass x velocity

Question 8

Ek = ½ mv²

Answer 8

kinetic energy = 0.5 x mass x (speed)²

Question 9

Ep = m g h

Answer 9

gravitational potential energy = mass x gravitational field strength (g) x height

Question 10

P = E/t

Answer 10

power = energy transferred/time

Question 11

P = W/t

Answer 11

power = work done/time

Question 12

efficiency equation using energy transfer

Answer 12

efficiency = useful output energy transfer/total input energy transfer

Question 13

efficiency equation using power output and input

Answer 13

efficiency = useful power output/total power input

Question 14

v = f λ

Answer 14

wave speed = frequency x wavelength

Question 15

Q = I t

Answer 15

charge flow = current x time

Question 16

V = I R

Answer 16

potential difference = current x resistance

Question 17

P = V I

Answer 17

power = potential difference x current

Question 18

P = I² R

Answer 18

power = (current)² x resistance

Question 19

E = P t

Answer 19

energy transferred = power x time

Question 20

E = Q V

Answer 20

energy transferred = charge flow x potential difference

Question 21

P = m/V

Answer 21

density = mass/volume

Question 22

weight = mass x gravitational field strength (g)

Answer 22

W = m g

Question 23

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

Answer 23

W = F s

Question 24

force applied to a spring = spring constant x extension

Answer 24

F = k e

Question 25

distance travelled = speed x time

Answer 25

s = v t

Question 26

acceleration = change in velocity/time taken

Answer 26

a = Δv/t

Question 27

resultant force = mass x acceleration

Answer 27

F = m a

Question 28

momentum = mass x velocity

Answer 28

p = m v

Question 29

kinetic energy = 0.5 x mass x (speed)²

Answer 29

Ek = ½ mv²

Question 30

gravitational potential energy = mass x gravitational field strength (g) x height

Answer 30

Ep = m g h

Question 31

power = energy transferred/time

Answer 31

P = E/t

Question 32

power = work done/time

Answer 32

P = W/t

Question 33

efficiency = useful output energy transfer/total input energy transfer

Answer 33

efficiency equation using energy transfer

Question 34

efficiency = useful power output/total power input

Answer 34

efficiency equation using power output and input

Question 35

wave speed = frequency x wavelength

Answer 35

v = f λ

Question 36

charge flow = current x time

Answer 36

Q = I t

Question 37

potential difference = current x resistance

Answer 37

V = I R

Question 38

power = potential difference x current

Answer 38

P = V I

Question 39

power = (current)² x resistance

Answer 39

P = I² R

Question 40

energy transferred = power x time

Answer 40

E = P t

Question 41

energy transferred = charge flow x potential difference

Answer 41

E = Q V

Question 42

density = mass/volume

Answer 42

P = m/V