Q8 of 119 Page 156

In a head-on collision between two particles, is it necessary that the particles will acquire a common velocity at least for one instant?

Yes, the particles acquire a common velocity at least for one instant of time. In case of elastic collision, the particles separate after this instant and move with different velocities.


In case of inelastic collision, the particles stick together even after this instant and move with a common velocity.


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6

A bob suspended from the ceiling of a car which is accelerating on a horizontal road. The bob stays at rest with respect to the car with the string making an angle e with the vertical. The linear momentum of the bob as seen from the road is increasing with time. Is it a violation of conservation of linear momentum? If not, where is the external force which changes the linear momentum?

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 9

A collision experiment is done on a horizontal table kept in an elevator. Do you expect a change in the results if the elevator is accelerated up or down because of the non-inertial character of the frame?

 10

Two bodies make an elastic head-on collision on a smooth horizontal table kept in a car. Do you expect a change in the result if the car is accelerated on a horizontal road because of the non-inertial character of the frame? Does the equation “Velocity of separation = Velocity of approach” remain valid in an accelerating car? Does the equation “final momentum = initial momentum” remain valid in the accelerating car?