Q3 of 17 Page 236

Match the following

i) wheels and ball bearings – decrease friction


ii) grooves – increase friction


iii) earth excavators - based on Pascal’s law


iv) fall of an apple from the tree – non-contact force


More from this chapter

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1

Choose the correct answer.

a) The SI unit of pressure is N/m2.This unit is otherwise called _____________ (pascal, newton, joule)


b) Atmospheric pressure at sea level is approximately equal to ________ (105 N/m2, 107 N/m2, 103 N/m2)

 2

Fill in the blanks

Friction is a __________ force (contact / non-contact)

 4

Correct the given statement.

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

 5

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