# Physics

• Created by: jay1230
• Created on: 11-05-18 10:00
4 Energy sources.
Thermal / Kinetic / Gravitational potential / Chemical / Magnetic / Elastic potential / Electrostatic / Nuclear
1 of 24
What is a system
It is just a fancy word for a single object (e.g. the air in a piston) or a group of objects (e.g. two colliding vehicles)
2 of 24
Describe the energy transfers that occur when a car collides with a stationary object.
The normal contact force between the car and the object does work. It causes energy to be transferred from the car's kinetic energy store to other energy stores eg elastic potential and thermal energy of the object and the car body.
3 of 24
If energy is transferred to an object's kinetic energy store, what happens to its speed?
Energy is transferred to this store when an object speeds up and is transferred away from this store when an object slows down.
4 of 24
Give the equation for finding the energy in an object's gravitational potential energy store.
Gravitational potential energy = Mass x Gravitational field strength x height
5 of 24
What kind of energy store is energy transferred to when you compress a spring?
Elastic potential energy store
6 of 24
What does the variable 'e' stand for in the equation for energy in an elastic potential energy store?
Extension
7 of 24
What is the definition of the specific heat capacity?
Specific heat capacity is the amount of energy needed to raise the temperature of 1kg of a substance by 1 degrees C
8 of 24
Suggest why a material with a high specific heat capacity is better suited for use in a heating system than a material with a low specific heat capacity
Because the higher specific heat capacity keeps in more heat.
9 of 24
True or false? Energy can be destroyed.
FALSE
10 of 24
Give 2 equations to calculate power
Power = Energy tansferred/ Time OR Power = work done / Time
11 of 24
True or false? A high thermal conductivity means there is a high rate of energy transfer
TRUE
12 of 24
How can you reduce unwanted energy transfers in a machine with moving components?
Lubrication and thermal insulation
13 of 24
Give 4 ways to prevent unwanted energy transfers in a home
Cavity wall insulation, Loft insulation, Double-glazed windows, Draught excluders
14 of 24
True or False? Thicker walls make a house cool down quicker
FALSE
15 of 24
Give the equation that relates efficiency to power.
Efficiency = Useful power output / Total power input
16 of 24
Name some renewable energy resources
The sun / Wind / Water waves / Hydro-electricity / Bio-fuel / Tides / Geothermal
17 of 24
What is the difference between renewable and non renewable energy sources?
Non-renewable energy resources will run out however renewable will not
18 of 24
Give an example of how a renewable energy resource is used in everyday life
Solar water heater- works by using the sun to heat water which is them pumped into radiators in the building
19 of 24
Explain why solar power is considered to be fairly reliable energy soucre
Because it is only really reliable in the day time
20 of 24
Give 1 environmental impact of using wave power to generate energy
The main problems are disturbing the seabed and the habitats of marine animals, spoiling the view and being a hazard to boats
21 of 24
Describe how you can reduce the acid rain caused by burning coal and oil
It can be reduced by taking the sulfur out before the fuel is burned or cleaning up the emissions
22 of 24
Give one environmental benefit of using nuclear power
nuclear power is clean but the waste is very dangerous
23 of 24
Explain why the UK plans to use more renewable energy resources in the future.
Because non-renewable resources damages the environment and it will soon run out
24 of 24

## Other cards in this set

### Card 2

What is a system

#### Back

It is just a fancy word for a single object (e.g. the air in a piston) or a group of objects (e.g. two colliding vehicles)

### Card 3

#### Front

Describe the energy transfers that occur when a car collides with a stationary object.

### Card 4

#### Front

If energy is transferred to an object's kinetic energy store, what happens to its speed?

### Card 5

#### Front

Give the equation for finding the energy in an object's gravitational potential energy store.