Q5 of 17 Page 236

List out the following actions on the basis of contact force and non contact force

a) lifting a chair


b) the falling of a coconut from the tree


c) friction between the road and the tyre of a car


d) a comb attracts bits of paper


e) attraction between two magnets

Contact forces are those which need any point of contact to occur whereas non-contact forces are those which can show their effects without any contact.



a) lifting a chair – contact force


b) the falling of a coconut from the tree – non contact force


c) friction between the road and the tyre of a car – contact force


d) a comb attracts bits of paper – non contact force


e) attraction between two magnets – non contact force


More from this chapter

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3

Match the following

 4

Correct the given statement.

The gravitational force of moon is equal to the gravitational force of earth.

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By observing the diagram, answer the following.

a) How does the pressure at A differ from the pressure at B.?


b) The pressure at B is greater than the pressure at D. Is it true?. Justify your answer.


c) Compare the pressure at A and C.


d) If the water is replaced with mercury, how would this affect the pressure at A and D?


 7

We know Pressure = Force / Area

If 50 N force is applied on a liquid and it experiences 25 N/m2 pressure.


Find out the area on which the force is applied?