Physics Conservation of Energy

Question 1

What are the units for energy?

Answer 1

Joules.

Question 2

Describe how + and - works with work and energy?

Answer 2

If work/energy is done on an object then its +

If work/energy is done by the object then its -

Question 3

What is the equation for potential energy?

Answer 3

U = mgh

Question 4

What is the equation for work without friction?

Answer 4

Work= the parallel force ( displacement)

Question 5

What is the shortcut velocity equation?

Answer 5

v = sqroot (2gh)

Question 6

What are the two equations for power?

Answer 6

Power = work/ time
Power = force ( velocity)

Question 7

Describe isochronic conditions.

Answer 7

Isochronic is the same as isovolumetric. This means, the volume of the container doesn’t change. As a result, the volume on a PV graph doesn’t change. There is no work done because there is no area under the curve.

Question 8

Describe isobaric conditions

Answer 8

Isobaric means the pressure of the container doesn’t change. As a result, the volume on the graph changes and the work can be calculated by finding the area under the graph.

Question 9

Describe the consequences of gas expanding and compressing in relation to work.

Answer 9

As gas expands then work is done BY the gas, therefore the sign in positive.
As gas compressed then work is being down ON the gas. Therefore, the sign is negative.