1) Explain the reasons for the following.
a) Why dust comes out of a carpet when it is beaten with a stick?
b) Luggage kept on the roof of a bus is tied with a rope.
c) Why a pace bowler in cricket runs from a long distance before he bowls?
Answers
Answer:
1:- An object's inertia tends to resist any change in its state of rest or motion. If a carpet is beaten with a stick then the carpet begins to move. ... The dust particles remain in a state of rest, while the carpet moves, as per Newton's first law of motion. The particles of dust thus emerge from the carpet.
2:-A luggage is usually tied with a rope on the roof of buses. When a moving bus suddenly stops, the luggage on its roof tends to continue in the state of motion due to inertia of motion. ... Thus, to avoid the falling of the luggage, it is tied with a rope on the roof of a bus.
3:- the bowler runs from a long distance before he is throwing a ball towards the batsman. such that he is in high motion. ... although the bowler stops, the ball travels by continuing its motion upto some distance high with the inertia. this is because of the ball is still have its momentum and inertia.
1)
Let me explain first what is inertia,
It is a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force. : a tendency not to move or change.
Law of inertia, also called Newton's first law, postulate in physics that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.
Inertia is a force. Inertia is a force which keeps stationary objects at rest and moving objects in motion at constant velocity. ... An object would not have any inertia in a gravity-free environment (if there is such a place). Inertia is the tendency of all objects to resist motion and ultimately stop.
a) when the carpet is being beaten the carpet is actually moving but the dusts wanna remain in their place due inertia of rest. And that's why they comes out of the carpet and are attracted by the gravity and falls.
b) A luggage is usually tied with a rope on the roof of buses. When a moving bus suddenly stops, the luggage on its roof tends to continue in the state of motion due to inertia of motion.
Thus, to avoid the falling of the luggage, it is tied with a rope on the roof of a bus.
c) The pace bowler in cricket runs fast from a long distance before he bowls because when he run the bowler gains inertia. So by inertia of motion he can gain momentum. By gaining momentum the bowler can bowl rhe ball with more inertia means with more speed.
Bowler tend to gain some momentum which will help him to throw the ball with greater speed.
Hope it helps.....