Paper 1 energy

Question 1

work done=

Answer 1

force x distance moved in direction of force

= energy transfered

Question 2

what is power

Answer 2

the rate at which energy is transfered

Question 3

power=

Answer 3

energy/time taken

Question 4

1 watt =

Answer 4

1 joule per second

Question 5

when you pay for electricity what are you paying for

Answer 5

the energy transfered

Question 6

gravitational potential energy

Answer 6

when an object is lifted, work is done against gravity

Question 7

potential energy=

Answer 7

mass x g x height

where g= 10N/kg

Question 8

what type of object has kinetic energy

Answer 8

any object that moves has kinetic energy

Question 9

kinetic energy=

Answer 9

1/2 x mass x velocity squared

Question 10

what happens if a constant resultant force acts on an object

Answer 10

it will accelerate

Question 11

What happens when you stretch a rubber band or spring

Answer 11

The work you do is stored in it as elastic potential energy

Question 12

Elastic potential energy =

Answer 12

1/2 x spring constant x extension squared

Question 13

Useful energy

Answer 13

Energy transformed to where it’s wanted in the wanted form

Question 14

Wasted energy

Answer 14

Energy that is transformed to either the wrong place or in the wrong form

Question 15

Efficient device

Answer 15

A device where most of the energy is usually transformed

Question 16

What is efficiency

Answer 16

Measure of how much useful energy you get out of an object from the energy you put into it.