Energy

Question 1

Kinetic energy equation

Answer 1

Ek = 1/2mv^2 Kinetic energy = 1/2 x mass x (speed)^2

Question 2

Gravitational potential energy equation

Answer 2

Ep = mgh GPE = mass x gravitational field strength x height

Question 3

Elastic potential energy equation

Answer 3

Ee = 1/2ke^2 EPE = 1/2 x spring constant x (extension)^2

Question 4

Power equation (energy transfer)

Answer 4

P = E/T Power = energy transfer / time

Question 5

Power equation (work done)

Answer 5

P = W/T Power = work done / time

Question 6

Work done equation

Answer 6

W = fd Work done = force / distance

Question 7

Efficiency equation

Answer 7

Efficiency = useful output / total input

Question 8

Kinetic energy equation (units)

Answer 8

J = 1/2 x kg x (m/s)^2

Question 9

Gravitational potential energy equation (units)

Answer 9

J = kg x n/kg x m

Question 10

Elastic potential energy equation (units)

Answer 10

J = 1/2 x n/m x (m)^2

Question 11

Power equation (units)

Answer 11

W = J/s

Question 12

Work done equation (units)

Answer 12

J = N x m