physics equations

Question 1

Name the equation for weight

Answer 1

• Weight = mass x gravitational field strength
• W = m x g

Question 2

Name the equation for work done

Answer 2

• Work done = force x distance (along the like of action of the force)
• W = F x s

Question 3

Name the equation for force applied to a spring

Answer 3

• Force applied to a spring = spring constant x extension
• F = k x e

Question 4

Name the equation for a moment of a force

Answer 4

• Moment of a force = force x distance(normal to direction of force)
• M = F x d

Question 5

Name the equation for pressure

Answer 5

• Pressure = force/area
• p = F/A

Question 6

Name the equation for distance

Answer 6

• Distance = speed x time
• s = v x t

Question 7

Name the equation for acceleration

Answer 7

• Acceleration = change in velocity/time taken
• a = Δv/t

Question 8

Name the equation for resultant force

Answer 8

• Resultant force = mass x acceleration
• F = m x a

Question 9

Name the equation for momentum

Answer 9

• Momentum = mass x velocity
• p = m x v

Question 10

Name the equation for kinetic energy

Answer 10

• Kinetic energy = 1/2 x mass x speed^2
• Ek = 1/2 x m x v^2

Question 11

Name the equation for gravitational potential energy

Answer 11

• GPE = mass x gravitational field strength (g) x height
• Ep = m x g x h

Question 12

Name the equation for power

Answer 12

• Power = energy transferred/time
• P = E/t
  OR
• Power = work done/time
• P = W/t

Question 13

Name the equation for efficiency

Answer 13

• Efficiency = useful output energy transfer/total input energy transfer
  OR
• Efficiency = useful power output/total power input

Question 14

Name the equation for wave speed

Answer 14

• Wave speed = frequency x length
• v = f x λ (lamda)

Question 15

Name the equation for charge flow

Answer 15

• Charge flow = current x time
• Q = I x t

Question 16

Name the equation for potential difference

Answer 16

• Potential difference = current x resistance
• V = I x R

Question 17

Name the equation for power (circuits 1)

Answer 17

• Power = potential difference x current
• P = V x I

Question 18

Name the equation for power (circuits 2)

Answer 18

• Power = current^2 x resistance
• P = I^2 x R

Question 19

Name the equation for energy transferred

Answer 19

• Energy transferred = power x time
• E = P x t
  OR
• Energy transferred = charge flow x potential difference
  *E = Q x V

Question 20

Name the equation for density

Answer 20

• Density = mass/volume
• ρ = m/V

Question 21

Name the equation for elastic potential energy

Answer 21

• Elastic potential energy = 1/2 x spring constant x extension
• Ee = 1/2 x k x e^2

Question 22

Name the equation for specific heat capacity

Answer 22

• Change in thermal energy = mass x specific heat capacity x temperature change
• ΔE = m x c x Δθ

Question 23

Name the equation for total resistance

Answer 23

• Total resistance = resistance of component 1 + resistance of component 2
• Rt = R1 + R2