Energy (physics)

Question 1

What is the equation for power?

Answer 1

work done or energy transferred / time

Question 2

What is the equation for work done?

Answer 2

force x distance moved

Question 3

What is the equation for GPE?

Answer 3

weight (or mg) x change in height

Question 4

What is the equation for KE?

Answer 4

1/2 x mass x speed squared

Question 5

What is the equation for EPE?

Answer 5

1/2 x k x e (K=spring constant) (e=extension)

Question 6

What type of diagram represents energy transfers?

Answer 6

Sankey diagram

Question 7

A chocolate bar and a battery both have what kind of energy store?

Answer 7

Chemical

Question 8

If you carry a shopping bag with weight 5N 2m across a room, how much work is done on the bag?

Answer 8

0J

Question 9

How do you determine energy efficiency?

Answer 9

Useful output / total input x 100

Question 10

Why does running to the top of a hill require more energy than walking?

Answer 10

Running takes less time

Question 11

Name two different units of work done

Answer 11

Nm, J

Question 12

Name three types of non-renewable energy

Answer 12

coal, oil, gas, nuclear

Question 13

give a disadvantage of using wind turbines

Answer 13

Relies on weather (is best) also kills birds and is noisy

Question 14

How does a Van Der Graaf generator work?

Answer 14

kahdjshkdas

Question 15

You rub an acetate rod with a cloth. What happens?

Answer 15

electrons go from the rod to the cloth

Question 16

After rubbing an acetate rod with a cloth, what happens if you bring them back together again (not rubbing)?

Answer 16

they will attract

Question 17

If you were wearing rubber boots, could you get a static shock from a Van der Graaf generator?

Answer 17

no