Energy P1

Question 1

Kinetic Energy= 0.5 x mass x (speed) 2

Answer 1

Ek =1/2 m v2

Question 2

gravitational potential energy = mass x gravitational field strength (g) x height

Answer 2

Ep= m g h

Question 3

power= energy transferred/time

Answer 3

P = E/t

Question 4

efficiency ?

Answer 4

useful power output/ total power input

Question 5

elastic potential energy= 0.5 x spring constant x (extension)2

Answer 5

Ee= 1/2 K e2

Question 6

work done = force x distance (along the line of action of the force )

Answer 6

W= F s

Question 7

what are the different types of energy stores?

Answer 7

magnetic
internal (thermal)
chemical
kinetic
electrostatic
elastic potential
gravitational potential
nuclear

Question 8

magnetic energy?

Answer 8

The energy stored when repelling poles have been pushed closer together or when attracting poles have been pulled further apart. Fridge magnets, compasses, maglev trains which use magnetic levitation.

Question 9

Internal (thermal) energy

Answer 9

The total kinetic and potential energy of the particles in an object, in most cases this is the vibrations - also known as the kinetic energy - of particles. In hotter objects, the particles have more internal energy and vibrate faster. Human bodies, hot coffees, stoves or hobs. Ice particles vibrate slower, but still have energy.

Question 10

Chemical energy

Answer 10

The energy stored in chemical bonds, such as those between molecules. Foods, muscles, electrical cells.

Question 11

Kinetic energy

Answer 11

The energy of a moving object. Runners, buses, comets.

Question 12

Electrostatic energy

Answer 12

The energy stored when repelling charges have been moved closer together or when attracting charges have been pulled further apart. Thunderclouds, Van De Graaff generators

Question 13

Elastic potential energy

Answer 13

The energy stored when an object is stretched or squashed. Drawn catapults, compressed springs, inflated balloons.

Question 14

Gravitational potential energy

Answer 14

.the energy an object has due to its height. Aeroplanes, kites, mugs on a table.

Question 15

Nuclear

Answer 15

The energy stored in the nucleus of an atom. Uranium nuclear power, nuclear reactors.

Question 16

Work done?

Answer 16

force applied x distance moved

Question 17

Energy stores?

Answer 17

Thermal, kinetic, light, Gravitational potential, chemical, sound, electric , elastic , nuclear

Question 18

Conservation of energy:

Answer 18

it can not be destroyed or created only transferred

Question 19

Ep?

Answer 19

Ep= mgh

Question 20

Ek?

Answer 20

Ek= 1/2 mv2

Question 21

Ee?

Answer 21

1/2 Ke2

Question 22

power is the rate of transfer

P?

Answer 22

P= E/t

Question 23

conductors?

Answer 23

a conductor is a material that transfers energy by conduction. a good conductor transfers energy quickly

Question 24

insulators?

Answer 24

an insulator are materials which slow down the rate of energy transfer, and can be used to reduce energy loss in homes.

Question 25

Energy resources (things that make energy)

Answer 25

fossil fuels
nuclear fuel 
bio fuel
wind
hydroelectricity
geothermal 
the tides 
the sun
water waves