Physics

Question 1

Name 6 ways in which energy is stored

Answer 1

Chemical energy
Kinetic energy
Thermal energy 
Gravitational potential energy
Elastic potential energy
Nuclear energy

Question 2

Name ways in which energy is transferred.

Answer 2

Electricity
Sound
Heating
Light
Force

Question 3

Give some examples of renewable energy sources

Answer 3

Biomas (wood)
Biofuels
Solar energy
Wave energy
Tidal energy
Wind energy
Hydroelectric energy
Geothermal energy

Question 4

Give some examples of non-renewable energy sources

Answer 4

Coal
Oil
Natural gasses

Question 5

If a ball is rolling down a slope what is the original and final energy store?

Answer 5

Original store = Gravitational potential energy

Final store = Kinetic energy

Question 6

When burning a magnesium ribbon what is the original and final energy store?

Answer 6

Original store = Chemical energy

Final store = Thermal energy

Question 7

Describe how fossil fuels are formed.

Answer 7

• Plants and animals die
• They are buried under mud so that they don’t rot
• The mud changes to rock and the animal changes to oil or gas/ the plant changes to coal.

Question 8

Suggest some ways in which we can reduce the use of fossil fuels.

Answer 8

• Use more RENEWABLE energy resources
• Use efficient appliances
• Walk, cycle etc on short journeys
• Use less energy on heating rooms (wear warmer clothing)

Question 9

What does ‘efficiency’ mean?

Answer 9

Efficiency is a way of saying how much of the energy transferred is useful. An efficient appliance DOES NOT WASTE ENERGY

Question 10

What unit is used for measuring forces (gravity, weight)?

Answer 10

Newtons

Question 11

What unit is used for measuring mass?

Answer 11

Kg

Question 12

What unit is used for measuring pressure?

Answer 12

N/m2 or N/cm2 or Pa

Question 13

What is the difference between mass and weight?

Answer 13

Mass is how much stuff something is made of, weight is how much force is acting upon something.

Question 14

What is the equation used to find weight?

Answer 14

Weight = mass x gravitational field strength
Gravitational field strength on Earth = 10 N/Kg
SO…
Weight = mass x 10

Question 15

What are elastic and plastic materials?

Answer 15

Elastic = a material/object THAT RETURNS to its original shape when a force is taken of it. Eg. a spring
Plastic = a material/object THAT DOES NOT RETURN to its original shape when a force is taken of it. Eg. plastercine

Question 16

Describe how pressure depends on force and area.

Answer 16

The bigger the area the smaller the pressure, the smaller the area the bigger the pressure.
The bigger the force the bigger the pressure, ehe smaller the force the smaller the pressure.

Question 17

What is the equation used to find pressure?

Answer 17

Pressure = force ÷ area

Question 18

What is current?

Answer 18

The current is the flow of charge around a circuit. It DOES NOT get used up.

Question 19

How do you measure current?

Answer 19

Using an Ammeter

Question 20

Name some conductors and insulators of electricity.

Answer 20

Conductors = metals
Insulators = plastics

Question 21

Explain how switches work and how they can control the circuit.

Answer 21

Switches break and complete the circuit depending on whether they are open or closed. If a switch in a series circuit is closed nothing will work because the circuit will not be complete.

Question 22

What is the difference between series and parallel circuits?

Answer 22

In a series circuit all switches have to be closed for anything to work, however, in a parolee circuit there are 2 loops so only 1 has to be complete to switch certain things on.

Question 23

Why are parallel circuits used?

Answer 23

So that in houses you can switch on only the ones you want on and you don’t have to have all of them on.