Conversation and dissipation of energy

Question 1

what is a closed system?

Answer 1

an object or a group of objects for which the total energy is constant

Question 2

what is the conservation of energy?

Answer 2

energy can’t be created or destroyed

Question 3

what is wasted energy?

Answer 3

the energy that is not usefully transferred

Question 4

what’s the equation for work done?

Answer 4

work done = force x distance moved in the direction of the force

Question 5

give an example of chemical energy

Answer 5

food fuel and electric batteries

Question 6

give an example of kinetic energy

Answer 6

in moving objects

Question 7

give an example of gravitational potential energy

Answer 7

in objects raised above a planet surface

Question 8

give an example of elastic potential energy

Answer 8

in a stretch compressed or twisted object

Question 9

give an example of thermal energy

Answer 9

heated object

Question 10

give an example of magnetic energy

Answer 10

in any object with a magnetic field

Question 11

give an example of electrostatic energy

Answer 11

in electrostatic forces between charges

Question 12

give an example of nuclear energy

Answer 12

the forces acting between atomic nuclei

Question 13

describe a mechanical energy transfer

Answer 13

when a force acts and an object moves

Question 14

describe an electrical energy transfer

Answer 14

when an electric current flows

Question 15

describe and heated energy transfer

Answer 15

a temperature difference between objects

Question 16

describe a radiation energy transfer

Answer 16

electromagnetic waves or sound

Question 17

what’s the formula for calculating kinetic energy?

Answer 17

kinetic energy = half x mass(kg) x speed(m/s) squared

Question 18

what’s the formula for calculating gravitational potential energy?

Answer 18

mass(kg) x gravitational field strength(n/kg) x height(m)

Question 19

what’s a fun way of remembering the different types of energy?

Answer 19

most kids hate learning every GCSE names

magnetic ,kinetic ,heat ,light ,elastic potential ,gravitational potential ,sound ,electricity ,nuclear

Question 20

what do you measure power in?

Answer 20

watts (W)

Question 21

what do you measure Force in?

Answer 21

Newton(N)

Question 22

what do you measure work done in?

Answer 22

joules(J)