Unit 3

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13.1 The turning effect of forces

Turning effects and moments
Levers (11-14)
Levers types (11-14)
Teachers/OHTs/Lever law
Teachers/OHTs/Levers
Teachers/OHTs/Levers orders

11-14/Mechanics/Statics/Experiments/Moments (14-16)

11-14/Mechanics/Statics/Problems/Lever law
11- 14/Mechanics/Statics/Problems/Levers

Centre of mass and centre of gravity
Centre of gravity (11-14)

11-14/Mechanics/Statics/Experiments/Centre of mass

Principle of moments, balancing and stability
Balancing (14-16)
Stability (11-14)

13.2 Circular motion

Centripetal force
Circular motion (14-16)
Centripetal force formula (14-16)

14-16/Mechanics/Circular motion/Problems/Circular motion and gravitation
14-16/Mechanics/Circular motion/Experiments/Whirling bung

13.3 Planets, satellites and centripetal force

Gravitational attraction between the Sun and planets
Gravitation (14-16)

The shapes of planetary orbits and Kepler's Laws
Men who shaped astronomy (14-16)
Kepler's laws (16-19)

Gravitation and centripetal force
Gravitation (14-16)

Geostationary satellites
Communication satellites (14-16)
Satellite orbits (14-16)

14-16/Mechanics/Circular motion/Problems/Circular motion and gravitation

13.4 Mirrors and lenses

The normal line and the laws of reflection
Reflection (11-14)

Images in a plane mirror
Reflection (11-14)
Image in a plane mirror (11-14)

11-14/Light/Experiments/Reflection

Images produced by convex and concave mirrors
Curved mirrors (11-14)

11- 14/Light/Experiments/Curved mirrors

Refraction at a plane interface
Refraction (11-14)

11-14/Light/Experiments/Refraction
11-14/Light/Experiments/Refraction 2

Prisms and colour
Prisms and colour (11-14)

Images produced by converging and diverging lenses
Convex and concave lenses (11-14)
Lenses (11-14)

11-14/Light/Experiments/Lenses
Teachers/OHTs/Lenses

The camera
Camera (11-14)
Pinhole camera (11-14)
CCD camera (16-19)
Teachers/OHTs/Camera

11-14/Light/Problems/Reflection and refraction
11- 14/Light/Experiments/Optical instruments
11-14/Light/Experiments/Light word search

13.5 Sound

Mechanical vibrations and sound
Sound waves (11-14)

Detection of sound by the human ear
Ear (11-14)

Sound waves and a medium
Sound waves (11-14)

Pitch and loudness.
Sound waves (11-14)

Quality of a note
Sound waves (11-14)

Reflection and refraction of sound waves
Refraction of sound (ADD REFLECTION OF SOUND) (11-14)

11-14/Sound/Problems/Sound

13.6 Ultrasonics

Ultrasonics
Ultrasonics (14-16)

13.7 Motion from electricity

Force on a conductor in a magnetic field
Electromagnetism (11-14)
Force on a current in a magnetic field (11-14)

11-14/Electricity and magnetism/Electromagnetism/Problems/Electromagnetism

13.8 Generators

Moving a magnet relative to a stationary coil
Electromagnetic induction (14-16)

Moving a coil relative a stationary magnet
Electromagnetic induction (14-16)

Size of the induced potential difference
Electromagnetic induction (14-16)
Mouse in a cornfield (14-16)

Generators
Generators (14-16)

14-16/Electricity and magnetism/Electromagnetic induction/Experiments/Electromagnetic induction

14-16/Electricity and magnetism/Electromagnetic induction/Problems/Generation of electricity

13.9 Transformers

Structure of a transformer
Transfo rmer (14-16)

Induced potential differences
Transfo rmer (14-16)

Transformer equation
Transfo rmer (14-16)

14-16/Electricity and magnetism/Electromagnetic induction/Problems/Transformer problems
14-16/Electricity and magnetism/Electromagnetic induction/Problems/Transformers

Step up and step down transformers
Transformer (14-16)

Transmission of electricity by the National grid
Transmission of electricity (14-16)

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