Question

1.What is pressure ? Write an experiment to show that liquids exert pressure sideways.

2.Why it is difficult to cut vegetables with a blunt knife?

3.Why do the school bags have broad shoulder straps ?

4.What is atmosphere and atmospheric pressure ? Up to what height air is present around the
earth?
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Answer 1

Answer:

1. Pressure is the force exerted per unit area.

To see if liquid exerts pressure side ways....

A deflated balloon is tide on the side tube of container opened at one side. Now fill water in the container, balloon connected inflates due to the pressure of liquid exerted sideways.This shows that liquids exerts pressure sideways also

2.The edge of a blunt knife is broader than a sharp knife.thiis exerts less pressure on the object than a sharp knife.That is why pressure is less and it is difficult to cut the object.

3. School bags have broader straps so that it exerts less pressure on the shoulder.

4.Atmosphere is the thick blanket of air surrounding the earth.Atmospheric pressure is the pressure exerted by air or atmosphere.