Explain why
(a) a horse cannot pull a cart and run in empty space,
(b) passengers are thrown forward from their seats when a speeding bus stops
suddenly.
(c) it is easier to pull a lawn mower than to push it.
(d) a cricketer moves his hands backwards while holding a catch.
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Answers
Answer:
a● absence of friction in space
b● due to inertia of motion when the bus stop passengers continues to be in motion
c●effective weight in the case of pulling is less than in the pushing, less force is required in pulling. Hence, it is easier to pull than to push.
d●the cricketer increases the time during which the high velocity of the moving ball decrease to zero. Thus, the acceleration of the ball is decreased and therefore the impact of catching the fast moving ball is also reduced.
Answer: (a) For pulling a cart or for running, the horse pushes the earth with its feet and reaction of the earth makes it move in the forward direction. Since in empty space there is no reaction force, therefore the horse cannot run in empty space.
(b) This is due to the inertia which states that body will remain in motion/rest until an external force is applied on it. When bus get stopped suddenly, our lower part come to the rest but upper part remain in the motion. so we are suddenly pulled in the forward direction.
(c)The ease with which you push or pull depends on the amount of friction acting on it. ... So the net vertical force will be more than weight of lawn mower. So the normal force will be more(N = mg + F sinФ, where Ф is the angle with which you are pushing) and hence friction will be more. So pulling is easier than pushing.
(d)cricketer moves his hands backwards during catching so as to take a longer time to stop the ball,this reduces the chances of injury. Greater the time used to stop the ball,lesser the impact of ball on hands and thus less chances of being hurt by ball and get injured.
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