Physics Equations

Question 1

Equation for Weight

include units

Answer 1

Weight(N) = mass(Kg) x gravity(n/kg)

Question 2

Equation for work done (J)

Answer 2

Work done(J) = force(N) x distance(m)

Question 3

Equation for force applied to string (N)

Answer 3

Force applied(N) = spring constant(N/m) x extension(m)

Question 4

Equation for Distance (m)

Answer 4

Distance(m) = speed(m/s) x time (s)

Question 5

Equation for Acceleration (m/s²)

Answer 5

Acceleration(m/s²) = change in velocity(m/s) ÷ time taken(s)

Question 6

Equation for resultant force (N)

Answer 6

Resultant force (n) = mass(kg) x acceleration(m/s)

Question 7

Equation for momentum (kg m/s)

Answer 7

Momentum (km/s) = mass (kg) x velocity (m/s)

Question 8

Equation for kinetic energy (j)

Answer 8

kinetic energy (j) = 0.5 x mass (kg) x speed^2 (m/s)

Question 9

Equation for Gravititional Potential Energy (GPE) (j)

Answer 9

GPE (j) = mass (kg) x Gravitational field strength (g) x height (m)

(Gravitational field strength is taken to be 10 on earth)

Question 10

Equation(s) for Power (W) with (J) and (S)

Answer 10

Power (W) = Energy Transferred (j) (or) Work done (j) ÷ Time (s)

Question 11

Equation for Efficiency (no units or %)

Answer 11

Efficiency = Useful Output (j) ÷ total input (j)

x100 for answer as %

Question 12

Equation for Wave speed (m/s)

Answer 12

Wave speed (m/s) = frequency (Hz) x wavelength (m)

Question 13

Equation for Charge flow (C)

Answer 13

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

Question 14

Equation for Potential Difference (P.D) (Volts)

Answer 14

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

Question 15

Equation for Power (W) with (V) and (A)

Answer 15

Power (W) = P.D (V) x Current (A)

Question 16

Equation for Power (W) with (A) and (Ω)

Answer 16

Power (W) = Current^2 (A) x Resistance (Ω)

Question 17

Equation for Energy transferred (J) with (W) and (S)

Answer 17

Energy Transferred (J) = Power (w) x Time (s)

Question 18

Equation for Energy transferred (J) with (C) and (V)

Answer 18

Energy transferred (J) = Charge (C) x P.D (V)

Question 19

Equation for Density (kg/m^3)

Answer 19

Density (kg/m^3) = Mass (kg) ÷ Volume (m^3)