Equations - all

Question 1

work done

Answer 1

work done = force x distance

W = Fs

Question 2

kinetic energy

Answer 2

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

Ek=1/2 m v^2

Question 3

gravitational potential energy

Answer 3

gravitational potential energy = mass x gravity x height

Ep = m g h

Question 4

power

Answer 4

power = work done / time

P = W / t

Question 5

elastic potential energy

Answer 5

kinetic energy = 1/2 mass x speed^2

Ek = 1/2 m v^2

Question 6

power

Answer 6

power = energy transferred / time

P = E / t

Question 7

efficiency

Answer 7

efficiency = useful energy out / total energy in

or

useful power out / total power in

Question 8

charge

Answer 8

charge = current x time

Q = It

Question 9

potential difference

Answer 9

potential difference = current x resistance

V = IR

Question 10

power

Answer 10

power = potential difference x current

P = VI

Question 11

power

Answer 11

power = current^2 x resistance

P = I^2 R

Question 12

energy

Answer 12

energy = power x time

E = Pt

Question 13

energy

Answer 13

energy = charge x potential difference

E = QV

Question 14

weight

Answer 14

weight = mass x gravitational field strength

W = mg

Question 15

force

Answer 15

force = spring constant x extension

F = ke

Question 16

movement

Answer 16

movement = force x distance

M = Fd

Question 17

pressure

Answer 17

pressure = force / area

p = F / A

Question 18

pressure

Answer 18

pressure = height x density x gravitational field strength

p = h ρ g

Question 19

distance

Answer 19

distance = speed x time

s = vt

Question 20

acceleration

Answer 20

acceleration = change in velocity / time

a = Δv / t

Question 21

force

Answer 21

force = mass x acceleration

F= ma

Question 22

momentum

Answer 22

momentum = mass x velocity

p = mv

Question 23

force

Answer 23

force = mass x change in velocity / change in time

F= m Δv / Δt

Question 24

period

Answer 24

period = 1 / frequency

T = 1 / f

Question 25

velocity

Answer 25

velocity = frequency x wavelength v = fλ

Question 26

magnification

Answer 26

magnification = image height / object height

Question 27

density

Answer 27

density = mass / volume ρ = m / v

Question 28

change in thermal energy

Answer 28

change in thermal energy = mass specific heat capacity x temp change ΔE = mcΔθ

Question 29

energy

Answer 29

energy = mass x specific latent heat E = mL

Question 30

constant

Answer 30

constant = pressure x volume pV = constant

Question 31

force

Answer 31

force = magnetic flux density x current x length F = BIl