Physics Equations

Question 1

m = ρ x V

Answer 1

Mass (kg) = Density (kg/m³) x Volume (m³)

Question 2

E = m x L

Answer 2

Energy (J) = Mass (kg) x Specific Latent Heat (J/kg)

Question 3

p x V = k

Answer 3

Pressure (Pa) x Volume (m³) = Constant

Question 4

P = V x I

Answer 4

Power (W) = Potential Difference (V) x Current (A)

Question 5

V = I x R

Answer 5

Potential Difference (V) = Current (A) x Resistance (Ω)

Question 6

E(k) = 0.5 x m x v²

Answer 6

Kinetic Energy (J) = 0.5 x Mass (kg) x Velocity² (m/s)²

Question 7

E(g.p.e) = m x g x h

Answer 7

Gravitational Potential Energy (J) =

Mass (kg) x Gravitational Field Strength (N/kg) x Height (m)

Question 8

E(e.p.e) = 0.5 x k x e²

Answer 8

Elastic Potential Energy (J) =

0.5 x Spring Constant (N/m) x Extension² (m)

Question 9

ΔE = m x c x Δθ

Answer 9

Change in Energy (J) =

Mass (kg) x Specific Heat Capacity (J/kg°C) x Temperature Change (°C)

Question 10

P = E ÷ t

Answer 10

Power (W) = Energy (J) ÷ Time (s)

Question 11

P = W ÷ t

Answer 11

Power (W) = Work Done (J) ÷ Time (s)

Question 12

Efficiency = Useful Output Energy Transfer ÷ Total Input Energy Transfer

Answer 12

Efficiency = Useful Power Output ÷ Total Power Input

Question 13

E = Q x V

Answer 13

Energy (J) = Charge (C) x Voltage (V)

Question 14

Q = I x t

Answer 14

Charge (C) = Current (A) x Time (s)