chapter 5 forces and energy

Question 1

work done to overcome friction…

Answer 1

is transferred as energy that heats the objects that rub together and heats the surroundings

Question 2

power

Answer 2

rate at which energy is transferred

Question 3

when does an object gain gravitational potential energy

Answer 3

when it is lifted up because work is done on it to overcome the gravitational force

Question 4

conservation of energy

Answer 4

energy cannot be created or destroyed

Question 5

elastic potential energy

Answer 5

the energy stored in an elastic object when work is done on the object

Question 6

kinetic energy

Answer 6

depends on an objects mass and speed

Question 7

wasted energy is…

Answer 7

eventually transferred to the surroundings, which becomes warmer

Question 8

types of energy stores

Answer 8

1) thermal
2) kinetic
3) gravitational potential
4) elastic potential
5) chemical
6) magnetic
7) electrostatic
8) nuclear

Question 9

what does the amount of g.p.e depend on in an object?

Answer 9

mass, its height and strength