P1 Conservation And Dissipation Of Energy

Question 1

What energy stores are there?

Answer 1

Chemical energy store.
Kinetic energy store.
Gravitational potential energy store.
Elastic potential energy store.
Thermal energy store.

Question 2

What do chemical energy stores include?

Answer 2

Fuels, foods or the chemicals found in batteries.

Question 3

What do kinetic energy stores describe?

Answer 3

Energy that an object has as it is moving.

Question 4

What is the gravitational potential energy store used to describe?

Answer 4

The energy store in object because of position such as object above ground.

Question 5

What does the elastic potential energy store describe?

Answer 5

Energy stored in springy object when stretched or squashed.

Question 6

What do thermal energy stores describe?

Answer 6

Energy substance has because of temperature.

Question 7

What does the principle of conservation of energy say?

Answer 7

Energy cannot be created or destroyed.

Question 8

What is the equation for work done by a force?

Answer 8

Energy transferred = work done.

Question 9

What equation do you use to calculate work done by a force when it causes displacement of an object?

Answer 9

Work done, W(joules, J) = force applied, F(newtons, N) * distance moved along the line of action of the force, s(metres, m).

Question 10

What is the equation of an object when it is lifted or lowered?

Answer 10

Change of gravitational potential energy store, ∆E(subscript:p)(joules, J) = mass, m(kilograms, kg) * gravitational field strength, g(newtons per kilogram, N/kg) * change of height, ∆h(metres, m).

Question 11

What are the power ratings for different energy transfers?

Answer 11

Torch = 1w.
Electric lightbulb = 100W.
Electric cooker = 10,000 == 10kW.
Railway engine = 1,000,000=1MW.
Saturn V space rocket = 100MW.
Very large power station = 10,000MW.
World demand for power = 10,000,000MW.
Star like the sun = 100,000,000, 000, 000, 000, 000MW.