# PRESSURE

1. Explain carefully why a person will make holes in a wooden floor when wearing spiked running shoes but not when wearing flat shoes.

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2. A crate of drinks weighs 2000 Newtons. If the area of its base is 0.5 square metres what is its pressure on the ground?

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3. A boiler contains steam at a pressure of 200 000 Newtons per square metre. If the area of one end is 1.5 square metres, what is the force on this end?

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4. If all the air is pumped out of a can describe and explain what happens to the can.

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5.  If you dive to the bottom of a swimming pool what happens to the pressure on our ears?

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6. Explain what difference you would have noticed in the pressure if the pool had been filled with mercury instead of water.

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7. A weather balloon, partly filled with helium gas is released from the ground and rises through the air. Describe and explain what happens to the balloon as it gains height.

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