Energy-forces Doing Work

Question 1

Energy is never…

Answer 1

Never created or destroyed only transferred

Question 2

Work done?

Answer 2

When an external force adds energy to a system

Question 3

Electric?

Answer 3

Chemical potential energy stored in batteries forms electric

Question 4

Waste?

Answer 4

Not 100% of energy is always efficient. Some energy is wasted eg. When machinery gets hot

Question 5

Power equation

Answer 5

Power = work done or energy transfered(j)/time taken s

Question 6

Efficiency equation

Answer 6

Useful energy output/total input energy

Question 7

Different types of energy?

Answer 7

GEEKS LUNGE

GPE, electrical, EPE, kinetic, sound, light, nuclear, chemical, heat

Question 8

Sankey diagram?

Answer 8

Useful energy goes to the right and wasted goes down. Width of arrow = number of joules

Question 9

Work done equation

Answer 9

Work done= force(n)x distance(m)

Question 10

Change in GPE equation

Answer 10

Change in GPE= mass x gravity x change in height

Question 11

Kinetic energy equation

Answer 11

1/2 X mass X velocity squared