Energy

Question 1

define energy

Answer 1

the ability to do work

Question 2

law of conservation of energy

Answer 2

energy cannot be created nor destroyed

Question 3

energy can be…?

Answer 3

energy can be transferred from one object into another
energy can be transformed from one type into another
energy can be stored

Question 4

potential energies

Answer 4

gravitational
elastic 
magnetic 
chemical 
nuclear

Question 5

kinetic energies

Answer 5

translational
eletrecial
light
sound
heat

Question 6

kinetic energy

Answer 6

Kinetic energy is the energy an object has due to its motion

Question 7

potential energy

Answer 7

Potential energy is energy that is stored in an object and not moving but has the potential to move.

Question 8

gravitational potential energy

Answer 8

the energy stored in an object has when its lifted above the ground

Question 9

elastic potetial energy

Answer 9

energy that is stored through stretching or squashing

Question 10

chemical potential energy

Answer 10

energy that stored is the chemical bonds of molecules and atoms

Question 11

magnetic potential energy

Answer 11

energy that stored through the position of magnets

Question 12

nucleur potential energy

Answer 12

energy involved in the reaction at the centre of atoms

Question 13

translational kinetic energy

Answer 13

energy assosciated with the whole object moving

Question 14

heat energy

Answer 14

the transfer of thermal energy

Question 15

light energy

Answer 15

energy that comes from electromagnetic waves

Question 16

sound energy

Answer 16

energy asosciated to the vibrations of particles in a material

Question 17

electrical energy

Answer 17

energy created by electric charges

Question 18

tranferring energy

Answer 18

Transfer of energy is when energy moves from one object to another without changing its form

Question 19

transforming energy

Answer 19

Transformation is when energy is changing from one form into another. E.g chemical energy into kinetic energy.

Question 20

output and input energies

Answer 20

input energy is the energy we start with. output energy is what we finish with

Question 21

how is efficiency calculated?

Answer 21

efficiency= useful energy output ÷ energy input x 100%

Question 22

3 ways thermal energy can be transferred

Answer 22

conduction, convection and radiation

Question 23

conduction

Answer 23

heat transferred between substances in direct contact with each other. the transfer of heat through collision in particles
Example: grabbing the handle of a hot pan, walking barefoot on concrete during the summer, ironing clothes.

Question 24

convection

Answer 24

Thermal energy that is transferred through movement in particles in fluids such as water and air
Examples: Boiling water, heat in a room, the ocean

Question 25

radiation

Answer 25

Heat which is transferred through empty space, with electromagnetic waves.
Examples: warmth from the sun, a campfire, opening the oven door