Topic 1 - Energy transfers

Question 1

work done - equation

Answer 1

work done = force x distance (W=Fs) - TRIANGLE

Question 2

work done - units

Answer 2

work=J force=N distance=m

Question 3

kinetic energy - equation

Answer 3

kinetic energy=1/2 x mass x (speed) squared (ke=1/2mv^2)

Question 4

kinetic energy - units

Answer 4

energy=J mass=kg speed=m/s

Question 5

Gravitational potential energy - equation

Answer 5

gravitational potential energy=mass x gravitational field strength x height (GPE=m x g x h) - TRIANGLE

Question 6

Gravitational potential energy - units

Answer 6

energy=J mass=kg gravity mass=kg height=m

Question 7

Power - equation

Answer 7

power= energy transferred / time (P=E/t) - TRIANGLE
or
power=work done / time (P=W/t) - TRIANGLE

Question 8

Power - units

Answer 8

power= W (watts) energy\work done=J time= s

Question 9

Efficiency - equation

Answer 9

Efficiency = useful output energy transfer / total input energy transfer

Question 10

Energy transferred - equation

Answer 10

energy transferred = power x time (E=Pt) - TRIANGLE

Question 11

Energy transferred - units

Answer 11

energy=J Power=W time=s