# 03. Physics Equations Flashcards

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1
Q

Weight

W

A

Weight = mass x gravitational field strength

W = m x g

2
Q

Work done

W

A

Work Done = force x distance (along line of action)

W = F x s

3
Q

Force applied to a spring

F

A

Force applied to a spring = spring constant x extension

F = k x e

4
Q

(Physics Only) Moment of a force

A

Moment = force x distance

M = F x d

5
Q

(Physics Only) Pressure

P

A

Pressure = force normal to a surface / area of that surface

P = F / A

6
Q

Distance travelled

s

A

Distance = speed x time

s = v x t

7
Q

Force

F

A

Force = mass x acceleration

F = m x a

8
Q

Acceleration

a

A

Acceleration = change in velocity / time taken

a = Δv / t

9
Q

Momentum

p

A

Momentum = mass x velocity

p = m x v

10
Q

Kinetic energy

Ek

A

Kinetic Energy = 1/2 x mass x (velocity)2

Ek = 1/2 x m x v2

11
Q

Gravitational potential energy

Ep

A

Gravitational Potential Energy = mass x gravitational field strength x height

Ep = m x g x h

12
Q

Power

P

A

Power = energy transferred / time

P = E / t

13
Q

Power

P

A

Power = work done / time

P = W / t

14
Q

Power

P

A

Power = potential difference x current

P = I x V

15
Q

Power

P

A

Power = current2 x resistance

P = I2 x R

16
Q

Efficiency (Energy)

A

= Useful output energy transfer / total input energy transfer

17
Q

Efficiency (power)

A

= useful power output / total power input

18
Q

Wave speed

v

A

Wavespeed = Frequency x wavelength

v = f x λ

19
Q

Charge flow

Q

A

Charge flow = current x time

Q = I x t

20
Q

Potential difference

V

A

Potential Difference = current x resistance

V = I x R

21
Q

Energy transferred

E

A

Energy = power x time

E = p x t

22
Q

Energy transferred

E

A

Energy transferred = charge flow x potential difference

E = Q x V

23
Q

Density

ρ

A

Density = mass / volume

ρ = m / V