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science revision (forces ((speed, direction of movement, shape (for…
science revision
MIXTURES
in the way that different coloured sweets can be picked out from a mixed packet and put into separate piles.
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compound are made of 2 different kinds of elements #
Chemical elements constitute all of the ordinary matter of the universe. However astronomical observations suggest that ordinary observable matter makes up only about 15% of the matter in the universe
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Atoms of different elements can join together in chemical reactions to form compounds.
For example hydrogen and oxygen are elements. They react together to form water, a compound.
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forces
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A force can be a push or a pull. For example, when you push open a door you have to apply a force to the door. You also have to apply a force to pull open a drawer.
newtons 1st law The focus of Lesson 1 is Newton's first law of motion - sometimes referred to as the law of inertia. An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. #
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shape (for example, an elastic band gets longer if you pull it)
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