Physics Equations

Question 1

What is the kinetic energy formula?

Answer 1

Kinetic energy (J) = 1/2 x mass(kg) x velocity^2(m/s)

Question 2

What is the elastic potential energy formula?

Answer 2

Elastic potential energy (J) = 1/2 x spring constant (N/m) x extension^2 (m)

Question 3

What is the gravitational potential energy formula?

Answer 3

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

Question 4

What is the equation for power?

Answer 4

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

Question 5

What is the formula for efficiency?

Answer 5

Efficiency = useful output energy transfer/total input energy transfer

Question 6

What is the formula for specific latent heat?

Answer 6

Specific latent heat (J/kg) = energy (J) / mass(kg)

Question 7

What is Boyle’s constant?

Answer 7

Pressure (Pa) x volume (m^3) = constant

Question 8

What is the formula for weight?

Answer 8

Weight(N) = mass(kg) x gravitational field strength (N/kg)

Question 9

What is the formula of work done?

Answer 9

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

Question 10

What is the formula for force of a spring?

Answer 10

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

Question 11

What is the formula for moment of a force?

Answer 11

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

Question 12

What is the formula for pressure?

Answer 12

Pressure (Pa) = force (N) / area (m^2)

Question 13

What is the formula for pressure due to a column of liquid?

Answer 13

Pressure (Pa) = height(m) x density of liquid (kg/m^3) x gravitational field strength (N/kg)

Question 14

What is the formula for speed?

Answer 14

Speed (m/s) = distance(m) / time(s)

Question 15

What is the formula for acceleration?

Answer 15

Acceleration (m/s^2) = final velocity - initial velocity (m/s) /time taken (s)

Question 16

What is the formula for momentum?

Answer 16

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

Question 17

What is the formula for the resultant force?

Answer 17

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

Question 18

What is the formula for wave speed?

Answer 18

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

Question 19

What is the formula for a period?

Answer 19

Period = 1/frequency (Hz)

Question 20

What is the formula for change in momentum?

Answer 20

Change in momentum = mass(kg) x change in velocity(m/s)
change in momentum = force (N) x change in time

Question 21

What is the formula for charge flow?

Answer 21

Charge flow (Coulombs) = current ( Amps) x time (s)

Question 22

What is a formula for potential difference? (Ohm’s law)

Answer 22

Potential difference (V) = current (Amps) x resistance ( Omega symbol)

Question 23

What are the equations for power in electrical circuits?

Answer 23

Power (J) = potential difference (V) x current (Amps)
Power (J) = [ current (amps) ]^2 x resistance ( Omega symbol)

Question 24

What are the formulas for energy transferred un electrical circuits?

Answer 24

Energy transferred (J) = power (J) x time(s)
Energy transferred (J) = charge flow (Coulomb) x potential difference (V)