SECTION TWO

Conservation of energy and momentum

 Describe the different forms that energy can take.
Explain the principle of conservation of energy and discuss its implications including the concept of efficiency, giving appropriate examples to support your commentary.
Define momentum and explain the law of conservation of momentum using a number of appropriate examples.

 SECTION THREE – the concepts and vocabulary of wave motion

Explain the terms commonly used to describe a wave. You must include suitable diagrams within your response. • Explain the difference between a transverse and a longitudinal wave giving an example of each. You must also identify the wavelength and frequency of each example you have given.
Explain how water waves and sound waves can be reflected, refracted and diffracted.

SECTION FOUR – the straight line model of the behaviour of light

Explain the laws of reflection and their use in a suitable instrument. You must include appropriate diagrams within your response. • Explain the laws of refraction.
Describe the conditions necessary for total internal reflection, giving an example of its use.

SECTION FIVE – magnets, magnetic fields, electric charge and electric current

Explain the nature of magnetism and its laws.
Draw the magnetic field around a bar magnet, a current carrying wire, and a solenoid. You must deduce the directions of the fields using suitable rules, and show these on your drawings.
Explain current and potential difference, and explain how these behave in both series and parallel circuits.

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