Topic 2- Energy transfer

Question 1

kettle

Answer 1

electrical energy > heat energy

Question 2

how do you calculate ‘ work’?

Answer 2

work done= force* distance moved ( in the direction of the force)

Question 3

thermal energy ( heat)

Answer 3

this is the energy that comes from hot things when they cool down

Question 3

how do you find kinetic energy? give word equation

Answer 3

Kineteic energy= 1/2* mass* speed²

K.E. = 1/2 mv²

Question 4

speakers

Answer 4

electrical energy > sound energy

Question 5

how do you find GPE?

Answer 5

gravitational potential energy= mass* gravitational field strength* height ( g on Earth= 10N/kg)

Question 6

kinetic energy

Answer 6

this is ‘ energy of motion’. All moving things have kinetic energy

Question 6

what happens to energy converters?

Answer 6

energy is often lost and heat and sound

Question 8

List 5 forms of potential energy and give an example

Answer 8

1. GPE- the energy released when gravity makes a rock fall
2. elastic potential energy- stretched spring
3. chemical energy- foods, fuels and batteries have CE they release the energy by chemical reaction, e.g burning fuel
4. electrical energy- wires carry EE to the lamps and other appliances
5. nuclear energy- radioactive materials

Question 8

micerophone

Answer 8

radiated energy > electrical energy

Question 10

where does the majority of the energy on Earth come from?

Answer 10

from the sun

Question 12

radiated energy

Answer 12

light and sound are both forms of energy which radiate ( spread) from their source

Question 13

lamp

Answer 13

electrical energy > light energy

Question 14

what energy do batteries change to?

Answer 14

chemical energy > kinetic energy

Question 15

potential energy

Answer 15

this is stored energy. for example when an object has energy because it has been moved from its original place

Question 16

can energy be destroyed?

Answer 16

No, energy can only be converted from one form to another