in the sand. Compare the
situadons.
Take a tumbler and on it with water. Cover the mouth of the tumbler
with a thick card similar to that of a postcard. Hold the tumbler
with one hand whtle keeping the card pressed to its mouth with
your other hand. Turn the tumbler upside down while keeping the
card pressed to its mouth. Make sure that the tumbler is hela
vertical. Gently remove the hand pressing the card. What do you
observe? Does the card get detached allowing the water to spill?
With a little practice you will find that the card continues to hold
water in the tumbler even after it is not supported by your hand.
Also try this activity by using a piece of cloth to hold the tumbler in
an upside down position (Fig. 11.21).
Fig. 11.21
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sory very sory i am very sorry
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