P2 work, energy and power

Question 1

Work done equation

Answer 1

Work done(J) = energy transferred(J)
Work = force x distance

W = Fd

Question 2

Conservation of energy

Answer 2

Energy cannot be created or destroyed it can only be transferred from one to another

Question 3

Kinetic energy equation

Answer 3

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

KE = 1/2mv^2

Question 4

Gravitational potential energy equation

Answer 4

Gravitational potential energy(J) = mass(kg) x g(10N/kg) x height(m)

GPE = mgh

Question 5

Types of stored energy

Answer 5

• Chemical
• Elastic
• Nuclear
• Gravitational

Question 6

Types of non-stored energy

Answer 6

• Kinetic
• Thermal/heat
• Electrical/electromagnetic
• Light
• Sound

Question 7

Pendulum energy transfer

Answer 7

Gravitational —> kinetic

Question 8

Clockwork toy energy transfer

Answer 8

Elastic —> kinetic

Question 9

Striking a match energy transfer

Answer 9

Chemical —> heat

Question 10

Buzzer energy transfer

Answer 10

Electromagnetic —> sound

Question 11

Water turbine energy transfer

Answer 11

Kinetic —> light

Question 12

Lamp energy transfer

Answer 12

Electromagnetic —> light

Question 13

Heater

Answer 13

Electromagnetic —> thermal

Question 14

Power equation

Answer 14

Power (W)= energy, work done(N)/time(s)

P = E/t