unit 18
Describe the oxygen and carbon dioxide cycle.
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Describe the water cycle.
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Explain the parts played by evaporation and condensation in the water cycle.
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Understand that the Sun the main source of energy for the water cycle.
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State how human activities affect the water cycle.
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unit 19
Understand that objects are pulled downwards because of gravitational force.
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Know that gravitational force is the attraction between things and the Earth.
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Understand that gravitational force gives weight to an object.
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Describe the effects of frictional force
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Recognise that an object that moves along a surface will eventually slow down and stop due to frictional force.
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Compare how objects move on different surfaces.
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Recognise that frictional force may prevent an object from starting to move.
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Know that frictional force includes air & water resistence.
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Explain frictional force in evertday life.
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Suggest preventive measures against damages from frictional forces.
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