Give reasons for the following:
(a) It is difficult to balance our body, when we accidentally step on a peel of a banana.
(b) Pieces of bursting cracker fall in all possible directions.
(c) A glass pane of a window is shattered, when a flying pebble hits it.
(d) It is easier to stop a tennis ball than a cricket ball moving at the same speed.
(e) Javelin thrower is marked foul, if an athlete crosses over the line marked for the throw. Athletes often fail to stop themselves before the line.
Answers
Answer:
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Explanation:
(a) The reason is that one cannot exert action force effectively on the slippery peel of banana in the backward direction. Hence, in response, the ground does not exert sufficient reaction force in forward direction and hence we lose our balance.
(b) This can be explained by the law of conservation of momentum. When due to explosion some pieces move in the same particular direction, then in order to conserve momentum, the remaining pieces move in the opposite direction.
(c) The reason is that, the glass pane of the window is a hard solid. The flying pebble suffers change in momentum in a very short time, so the force exerted by the glass window on the pebble will be large. Consequently the glass pane of the window will shatter.
(d) The reason is that mass of the cricket ball is more than that of a tennis ball. Thus, momentum is more in case of the cricket ball due to larger mass as compared to the tennis ball. So, less force has to be applied in the case of the tennis ball to stop.
(e) The reason is that when athletes are running for the throw then due to inertia of motion they often fail to stop themselves before the line.
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Hey mate
(a) It is difficult to balance our body when we accidently step on a banana peel because this is happening due to friction. The surface of banana peel is very slippery which means there are few irregularities and hence friction decreases and we tend to slip and fall.
(b) This can b explained by law of conservation of momentum, which says total momentum in a system is conserved.
his can b explained by law of conservation of momentum, which says total momentum in a system is conserved.before the bursting of the cracker the total momentum is Zero. . hence after the burst its momentum needs to be Zero according to
his can b explained by law of conservation of momentum, which says total momentum in a system is conserved.before the bursting of the cracker the total momentum is Zero. . hence after the burst its momentum needs to be Zero according tolaw of conservation of momentum.hence the particles fly off in such a way that each one's momentum is nullified by the one flying off in opposite direction.
(c) A glass pane of a window gets shattered when a flying pebble hits it, because the flying pebble is moving with some velocity while the glass pane is at the rest. When it hits the glass pane , it imparts momentum to the pane. Glass is amorphous solid and hence doesn't have cleavage property.
(d) Momentum (p) = mv
From the question, it is clear that velocity of both the balls is same. But mass of the cricket ball is more than that of tennis ball, and hance cricket ball has more momentum. Therefore it is easier to stop a tennis ball than a cricket ball moving with the same speed.
(e) The athletes who throw the javelins fails to stop themselves before the line due to inertia of motion. So, an athlete may crossed the mark line before throwing the javelin.
Hope it will be helpful to you
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