Physics Equations

Question 1

Density(kg/m^3)

Answer 1

Density(kg/m^3) = mass(kg) / volume(m^3)

Question 2

Distance travelled(m)

Answer 2

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

Question 3

Acceleration (m/s^2)

Answer 3

Acceleration (m/s^2) = change in velocity(m/s) / time(s)

Question 4

Kinetic Energy(J)

Answer 4

Kinetic Energy(J) = 0.5 x mass(kg) x (speed(m/s))^2

Question 5

Force(N)

Answer 5

Force(N) = mass(kg) x acceleration(m/s^2)

Question 6

Momentum(kgm/s)

Answer 6

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

Question 7

Work Done(J)

Answer 7

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

Question 8

Power(W)

Answer 8

Power(W) = work done(J) / time(s)

Question 9

Force exerted by a spring(N)

Answer 9

Force exerted by a spring(N) = extension(m) x spring constant(N/m)

Question 10

gravity force(N)

Answer 10

gravity force(N) = mass(kg) x gravitational field strength(N/kg)

Question 11

Potential energy(J) —- (In a gravity field)

Answer 11

Potential energy(J) = mass(kg) x height(m) x gravitational field strength(N/kg)

Question 12

Pressure (Pa)

Answer 12

Pressure(Pa) = force normal to a surface(N) / area of that surface(m^2)

Question 13

moment of a force(Nm)

Answer 13

moment of a force(Nm) = force(N) x distance(m)

Question 14

Charge flow (C)

Answer 14

Charge flow(C) = current(A) x time(s)

Question 15

Potential difference

Answer 15

Potential difference(V) = current(A) x Resistance(Ω)

Question 16

Energy Transferred

Answer 16

Energy Transferred(J) = charge(C) x p.d(V)

Question 17

Power

Answer 17

Power(W) = p.d(V) x current (A) = (Current(A))^2 x Resistance(Ω)

Question 18

Energy Transferred

Answer 18

Energy Transferred (J,kWh) = power(W,kW) x time(s,h)

Question 19

Wave speed(m/s)

Answer 19

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

Question 20

Efficiency

Answer 20

Useful output energy transfer(J) / input energy ransfer(J)