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Pressure 03

A girl wearing a trainer on one foot and a stiletto on the other exerts the most pressure on the ground with the stiletto. (Picture courtesy of justmakeit at Flickr)

Pressure 03

Try cutting a fruit with the flat side of a knife. Now try the thin side - it will cut smoothly. The flat side has a greater surface area, therefore less pressure. This is a good practical example of pressure. Try our third Science quiz on Pressure.

Which of these options do you prefer?

  1. What force is needed on an area of 4m2 to produce a pressure of 16Pa?

  2. What force is needed on an area of 5m2 to produce a pressure of 25Pa?

  3. The bottom of a box has an area of 5m2. What is the weight of the box to produce a pressure of 20Pa?

  4. The bottom of a box has dimensions 2m by 3m. What is the weight of the box to produce a pressure of 20Pa?

  5. A four legged table exerts a pressure of 8,000Pa on the ground. Each leg has an area of 0.01m2. What is the weight of the table?

  6. The dimensions of a ski are 8cm x 150cm. What is the weight of a skier standing on 2 skis to produce a pressure of 2,500Pa?

  7. What has to happen to the force exerted over a fixed area if the pressure doubles?

  8. What has to happen to the force exerted if the area doubles but the pressure is unchanged?

  9. Box A has a weight of 20N. It is put on top of box B. These two boxes exert a pressure of 60Pa. The area box B covers is 3m2. Find weight of box B.

  10. A girl is wearing a trainer on one foot and a stiletto on the other! Which exerts the most pressure on the ground?

Quiz written by Sue Davison

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