Energy Topic

Question 1

What are the eight energy stores.

Answer 1

Thermal
Kinetic
Gravitational potential
Elastic potential
Chemical
Magnetic
Electromagnetic
Nuclear

Question 2

What is the word that describes the transferred energy

Answer 2

Work done

Question 3

What are the 4 ways that energy can be transferred?

Answer 3

Mechanically (force)
Electrically (moving charges)
Heating
Radiation (light / sound)

Question 4

What are you doing when you apply a force to a spring

Answer 4

You are applying “work”. _ we are putting energy into a spring to stretch it. The stretched spring is storing the energy and it is called elastic potential.

Question 5

What is extension in a spring)

Answer 5

The extension is how much the length has changed from its original form. (Spring)

Question 6

What is the the symbol for extension in equations?

Answer 6

e (lowercase)

Question 7

What is the extension measured in?

Answer 7

Metres

Question 8

What is the realisation ship between force and extension?

Answer 8

They are directly proportional to each other except when the spring has too much force acting on it and the spring stretches too far and reaches its limit of proportionality - at this point when the force is removed the spring will not go back to its original form.

Question 9

What is the equation for elastic potential energy?

Answer 9

Ee = 0.5 x k x e(squared)

Question 10

What is k in the elastic potential equation?

Answer 10

Spring constant

Question 11

What is the spring constant measured in

Answer 11

N/m

Question 12

What is gravitational potential energy?

Answer 12

The energy stored in an object due to its position above the earths surface. This is due to the force of gravity acting on an object

Question 13

What is the equation for gravitational potential energy?

Answer 13

Ep = m x g x h
Energy = mass (kg) x gravitational field strength (N/kg) x height (m)

Question 14

What is the mass measured in (GPE)

Answer 14

Kg

Question 15

What is the height measured in (GPE)

Answer 15

m

Question 16

what is kinetic energy?

Answer 16

The energy stored in moving objects . Stationary objects don’t have any

Question 17

What is the equation for kinetic energy?

Answer 17

Ek = 0.5 x m x v(squared)
Kinetic energy = 0.5 x mass x speed squared

Question 18

What is the mass measured in (K)

Answer 18

Kg

Question 19

What is speed measured in?

Answer 19

M/s

Question 20

What is specific heat capacity?

Answer 20

The SHC of a substance is the amount of energy required to raise the temperature of 1kg of the substance by 1 degrees C

Question 21

How do you work out the change in thermal energy?

Answer 21

<E = m x c x <0
Change in thermal energy = mass x specific heat capacity x temperature change
(< is meant to be a triangle)

Question 22

What does efficiency tell us about an appliance

Answer 22

What percentage of the input energy is being used as useful output energy

Question 23

What is the equation for efficiency?

Answer 23

Useful power output divided by the total power input
If the question asks for a percentage times this by 100