Topic 4 Keywords

Unit 4 Keywords

Biomass - plants used as a fuel

Capital resource - energy resource that once used is not replaced

Fossil fuel - energy resource made from the bodies of animals or plants that lived millions of years ago (coal, oil, gas)

Fuel - substance that can be burnt releasing heat energy and is an energy resource

Geothermal - energy transferred as heat inside the Earth

Hydroelectric - transforming the energy from moving water into electrical energy

Joules - unit of energy

Mineral oil - Crude oil usually found deep below ground, formed from the bodies of tiny sea creatures

Non-renewable - energy resources that cannot be replaced

Renewable energy resource - energy resource that is continually replaced

Solar Cell - device to transform sunlight directly into electricity

Solar energy - energy from the Sun

Solar panel - device to collect solar energy

Thermometer - device for measuring temperature

Transform/transformed - to change the voltage of electricity

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http://michellephysics.posterous.com/

Scientific facts I need to remember for next time (EOY10 exam)

Components which affect the size of the current can be...

- resistor

- power supply 

but NOT ammeters or switch

Q: A lorry is traveling in a straight line and it is accelerating. The total forward force on the lorry is F and the total backward force is B.

Which is larger, force F or force B? Explain your answer.

A: Force F, because there must be an unbalanced force in order for the lorry to move and accelerate (in this case, moving forward, so force F is bigger).

The characteristic in which all electromagnetic waves share....

- SAME speed (not just speed!)

- They're all electromagnetic waves.

addition: Speed can affect both thinking and braking distance. 

3.14

Light waves are transverse waves which can be....
- reflected (eg from a surface of the mirror or body of water)
- refracted (as it passes from air through a different medium, changing its speed)
- diffracted (as it passes through small gaps etc.)


experiment: using laser beam

3.15

3.15) Recall that the angle of incidence equals the angle of reflection.

*All angles are calculated from the normal line.

Properties of an image in a plane mirror are:

1. The image and the object are equal distances from the mirror.
2. The image is laterally inverted. (Which is why an object appears to be back to front in a mirror, left becomes right and right becomes left.)
3. The image is virtual or imaginary as there is no light actually meeting at that point. You see the image because your brain thinks it is there - your brain always assumes that light has travelled in a straight line!

All waves can be reflected, but need different surfaces to reflect them. For example, high frequency sound waves can be reflected off dense materials in the body, and this is used to see a picture of babies in the womb - for instance, ultrasound.

(Pictures and information taken from... http://www.s-cool.co.uk/category/subjects/a-level/physics/reflection-refraction-and-polarisation) 

3.16

FOR PLANE MIRROR, THE IMAGE IS...
- The same size as the object
- The same distance as the object from the mirror
-Virtual (not real)
- Upright
- Laterally Inverted