Topic 1a - energy transfers (1. energy stores and transfers)

Question 1

define kinetic energy

Answer 1

anything moving has energy in its kinetic energy store

Question 2

define thermal energy

Answer 2

any object. The hotter it is, the more energy it has in its thermal energy store. also called internal energy store.

Question 3

define chemical energy store

Answer 3

anything that can release energy by a chemical reaction e.g. foods and fuels

Question 4

define gravitational potential energy

Answer 4

anything that has been lifted above the earth with a mass.

Question 5

define electro static energy

Answer 5

anything with an electric charge that is interacting with another electric charge .e.g. two charges that attract or repel

Question 6

define magnetic store

Answer 6

anything magnetic that is reacting with another magnet

Question 7

define elastic potential

Answer 7

anything that can be stretched or compressed

Question 8

define nuclear energy

Answer 8

atomic nuclei have energy in this store that can be released in nuclear reactions.

Question 9

what is a system

Answer 9

another word for a single object or a group of objects.

Question 10

what is a closed system

Answer 10

where neither matter nor energy can leave. the net change in the total energy of a closed system is always 0.

Question 11

what are the 4 types of energy transfers

Answer 11

mechanically
electrically
by heating
by radiation

Question 12

define transferring energy mechanically

Answer 12

an object moving due to a force acting on it e.g. pushing pulling stretching squashing

Question 13

define transferring energy electrically

Answer 13

a charge moving through a potential difference

Question 14

define transferring energy by heating

Answer 14

energy transferred from a hotter object to a cooler one

Question 15

define transferring energy by radiation

Answer 15

energy transferred by light sound waves

Question 16

what is work done

Answer 16

another way of saying energy transferred.

Question 17

what is the conservation of energy principle

Answer 17

energy can be transferred usefully stored or dissipated but can never be created or destroyed