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.
Yes, even when the net external force is zero, an object may travel with non-zero velocity.
A rain drop falls downwards with a constant velocity. The net force on the drop is zero because the weight of the drop is balanced by the upthrust and the viscosity of air.
When a carpet is beaten with a stick, dust comes out. Explain why?
Why it is advised to tie any luggage kept on the roof of a bus with a rope?
Explain, why is it difficult for a fireman to hold a hose, which ejects large amounts of water at a high velocity.
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.
