Q2 of 82 Page 77

When a horse pulls a cart, the force that helps the horse to move forward is the force exerted by

When the horse pulls the wagon, it pushes the ground in the backward direction. Due to the third law of motion, the ground exerts a forward force which has the same magnitude. As the backward force applied by the wagon is weaker than the force applied by the horse, the wagon moves in the forward direction.

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17

A plumb bob is hung from the ceiling of a train compartment. If the train moves with an acceleration ‘a’ along a straight horizontal track, the string supporting the bob makes an angle tan-1 (a/g) with the normal to the ceiling. Suppose the train moves on an inclined straight track with uniform velocity. If the angle of incline is tan-1 (a/g). the string again makes the same angle with the normal to the ceiling. Can a person sitting inside the compartment tell by looking at the plumb line whether the train is accelerated on a horizontal straight track or it is going on an incline? If yes, how? If no, suggest a method to do so.

 1

A body of weight ω1 is suspended from the ceiling of a room through a chain of weight ω2. The ceiling pulls the chain by a force

 3

A car accelerates on a horizontal road due to the force exerted by

 4

A block of mass 10 kg is suspended through two light spring balances as shown in figure (5-Q2).