Why it is advised to tie any luggage kept on the roof of a bus with a rope?
When a bus takes sharp turn on the road, a sudden jerk is felt. As a result of the sudden jerk, the luggage may fall down from the roof because of its tendency to continue moving in the original direction. In order to avoid this, the luggage is tied with a rope on the roof.
When a carpet is beaten with a stick, dust comes out. Explain why?
A batsman pushes a cricket ball which then roll on a level ground. After covering a short distance, the ball comes to rest. The ball slows to a stop because
(a) the batsman did not hit the ball enough.
(b) velocity is proportional to the force exerted on the ball.
(c) there is a force on the ball opposing the motion.
(d) there is no unbalanced force on the ball, so the ball would want to come to rest.
An object experiences a net zero external unbalanced force. Is it possible for the object to be travelling with a non-zero velocity? If yes, state the conditions that must be placed on the magnitude and direction of the velocity. If no, provide a reason.
Explain, why is it difficult for a fireman to hold a hose, which ejects large amounts of water at a high velocity.
