ACCUEIL	INFERER	LEXIQUE	ENTRAÎNEMENT	STRUCTURE

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	Hang two tins from long pieces of string. Fill one with wet sand and leave the other empty. Try pushing the cans		Use a force-meter (a very strong spring balance) to measure the strength of your arm muscles when you are pushing and when you are pulling.
	Use a weighing machine to find the weight of your body in Newton.		Flatten the end of a drinking straw and then trim the corners with scissors as in the diagram.
	Hold a convex (converging) lens so that the parallel rays of light from a distant house or tree are focused on a piece of paper.		Hold the mirror so that the parallel rays of light from a distant house or tree are focused on to a piece of paper.
	Set up a row of test-tubes and fill them with different amounts of water, so that the length of air is different in each tube.		Hold a book at arm's length and move it closer to find the nearest distance that you can focus it clearly without straining your eyes.
	Tie a small weight to a piece of string to form a plumbline. Let it hang down from your hand.		Hold a pencil in one hand and close one eye. Then, with another pencil in your other hand, try to make the two pencil points touch.