Energy Stores and Transfers

Question 1

what is the principal of conservation of energy?

Answer 1

energy can never be created or destroyed only transferred.

Question 2

what is the efficiency equation?

Answer 2

efficiency= useful energy output/total energy output x100

Question 3

example of energy being transferred

Answer 3

ball rolling up a slope:

• energy transferred MECHANICALLY from KINETIC energy store of the ball to its GPE store.
• some energy is transferred mechanically to the THERMAL energy of the ball and slop (friction)
• and then by HEATING to the thermal energy stores of the surroundings.

Question 4

what does the thickness of an arrow represent in sankey diagrams?

Answer 4

AMOUNT OF ENERGY. the thicker the arrow, the more energy it represents.