Equations (I think done)

Question 1

How can you calculate kinetic energy ?

Answer 1

kinetic energy(J) = ½ mass(kg) × speed^2(m/s) // Ek = ½ mv2

Question 2

How can you calculate elastic potential energy ?

Answer 2

elastic potential energy(J) = ½ spring constant(N/m) × extension^2(m) // Ee = ½ ke^2

Question 3

How can you calculate gravitational potential energy ?

Answer 3

gravitational potential energy(J) = mass(kg) × gravitational field strength(N/kg) × height(m) // Ep = mgh

Question 4

Equation linking change in thermal energy, mass, specific heat capacity and temperature change ?

Answer 4

change in thermal energy(J) = mass(kg) × specific heat capacity(J/kg°C) × temperature change(°C) // ΔE = mcΔθ

Question 5

Equation linking time, power and energy transferred ?

Answer 5

power(W) = energy transferred(J) ÷ time(s) // P = E ÷ t

Question 6

Equation linking work done, time and power ?

Answer 6

power(W) = work done(J) ÷ time(s) // P = W ÷ t

Question 7

What are the calculations for efficiency ?

Answer 7

efficiency = useful energy out ÷ total energy in // efficiency = useful power out ÷ total power in

Question 8

What is the equation for charge ?

Answer 8

charge(C) = current(A) × time(s) // Q = I × t

Question 9

What is the equation for potential difference ?

Answer 9

potential difference(V) = current(A) × resistance(Ω) // V = I × R

Question 10

Equation linking power, current and potential difference ?

Answer 10

power(W) = potential difference(V) × current(A) // P = V × I

Question 11

Equation linking power, current and resistance ?

Answer 11

power(W) = current^2(A) × resistance(Ω) // P = I^2 × R

Question 12

Equation linking power, time and energy ?

Answer 12

energy(J) = power(W) × time(s) // E = P × t

Question 13

Equation linking charge, potential difference and energy ?

Answer 13

energy(J) = charge(C) × potential difference(V) // E = Q × V

Question 14

How can you calculate density ?

Answer 14

density(kg/m^3) = mass(kg) ÷ volume(m^3) // ρ = m ÷ V

Question 15

Equation linking energy, mass and specific latent heat ?

Answer 15

energy(J) = mass(kg) × specific latent heat(J/kg) // E = m × L

Question 16

How to calculate weight ?

Answer 16

weight(N) = mass(kg) × gravitational field strength(N/kg) // W = m × g

Question 17

Calculation for work done ?

Answer 17

work done(J) = force(N) × distance(m) // W = F × s

Question 18

Equation linking spring constant, force and extension ?

Answer 18

force(N) = spring constant(N/m) × extension(m) // F = k × e

Question 19

How can you work out epe ?

Answer 19

elastic potential energy(J) = ½ spring constant(N/m) × extension(m)^2 // Ee = ½ ke^2

Question 20

How can you calculate distance in relation to speed and time ?

Answer 20

distance(m) = speed(m/s) × time(s) // s = v × t

Question 21

How can you find out acceleration ?

Answer 21

acceleration(m/s^2) = change in velocity(m/s) ÷ time(s) // a = Δv ÷ t

Question 22

Equation linking final velocity, initial velocity, acceleration and distance ?

Answer 22

final velocity(m/s)^2 - initial velocity(m/s) ^2 = 2 × acceleration(m/s^2) × distance(m) // v^2 - u^2 = 2 × a × s

Question 23

Equation linking force, acceleration and mass ?

Answer 23

force(N) = mass(kg) × acceleration(m/s^2) // F = m × a

Question 24

How can you calculate momentum ?

Answer 24

momentum(kgm/s) = mass(kg) × velocity(m/s) // p = m × v

Question 25

How can you calculate wave speed ?

Answer 25

wave speed(m/s) = frequency(Hz) × wavelength(m) // v = f × λ (v = velocity(m/s))

Question 26

What is an equation linking force, current, magnetic flux density and length ?

Answer 26

force(N) = magnetic flux density(T) × current(A) × length(m) // F = B × I × l

Question 27

How can you calculate the period of a wave ?

Answer 27

period(s) = 1 ÷ frequency(Hz) // T = 1 ÷ f