Give reasons for the following-
(a) We tend to slip when we step on a banana peel.
(b) It is easier to push a lighter box than a similar heavy box on the same floor.
(c) The force, needed to start a cart, is (somewhat) greater than the force
needed to keep it moving with a uniform speed.
(d) Sportsmen use shoes fitted with spikes.
e) Ball bearing are used in machines.
f) Tyres of the vehicles need to be changed regularly.
g) Machines parts are frequently oiled or greased.
h) sports cars, aeroplane and boats are designed to have A streamlined shape
I) Metal chains are wrapped on tyres when they run on icy roads.
j) Rollers are use for transporting luggage.
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Explanation:
(a) due to decrease of the force of friction between our feet and ground surface so we tend to sleep when we step on a banana peel falling on the ground surface
(b) we can push a lighter box easily than a heavier box since we know that have your object access to more friction than the lighter object
(C) due to kinetic friction is less than static friction as we know that a standing can is an example of static friction and a moving car is an example of kinetic friction in nature
(d) because these shots are given better grip so that piece of friction between the shoes and ground increases with the help of spikes
(e) ball bearings reduce the friction so that efficiency of the Machines is increased and it moves in a smooth manner
(f) due to friction treats on the tyre wear out and this increases the changes of kidding or sleeping of tyre on the road so tired of vehicles need to change regularity
(g) diesel oil and grease to reduce the friction between then any while decreasing the friction bearing and tearing of machinery part is reduced so there life get prolonged
(h) these are designed to have a streamlined shape so as to reduce the fluid friction and to make movement more Swift
(I) metal chains are wrap.in when they run on Icy roads to increase the force of friction so that it can move properly in respective directions
(j) rollers are used for transporting luggage to reduce friction causes between the surface of luggage and earth surface