In a collision between two cars, which would you expect to be more damaging to the occupants, if the cars collide expect to be more damaging to the occupants, if the cars collide and ramain together, or if the two rebound backward ? Explain.

Would you expect benzaldehyde to be more reactive or less reactive in nucleophilic addition reactions than propanal? Explain your answer.

If the molecules were not allowed to collide among themselves, would you expect more evaporation or less evapration?

Collision is a physical process in which two or more objects, either particle masses or rigid bodies, experience very high force of interaction for a very small duration. It is not essential for the objects to physically touch each other for collision to occur. Irrespective of the nature of interactive force and the nature of colliding bodies, Newton's second law holds good on the system. Hence, momentum of the system before and after the collision remains conserved if no appreciable external force acts on the system during collision. The amount of energy loss during collision, if at all, is indeed dependent on the nature of colliding objects. The energy loss is observed to be maximum when objects stick together after collision. The terminology is to define collision as 'elastic' if no energy loss takes place and to define collision as 'plastic' for maximum energy loss. The behaviour of system after collision depends on the position of colliding objects as well. A unidirectional motion of colliding objects before collision can turn into two dimensional after collision if the line joining the centre of mass of the two colliding objects is not parallel to the direction of velocity of each particle before collision. Such type of collision is referred to as oblique collision which may be either two or three dimensional. For which of the following collisions, the external force acting on the system during collision is not appreciable as mentioned in paragraph 1.

Two bodies make an elastic head on colision 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 noninertial character of the frame? Does the equation velocityof separation = velocity of approach remain valid in n accelerating car? Does the equation final momentum =initial momentum remain valid in the accelerating car?

Two racing cars 'A' and 'B' having masses 'M' and '2m' respectively start running from the starting line on a horizontal plane.Both cars 'A' and B' have same speed 'V' which is constant through out the journey. The track of the two cars are the arcs of concentric circle having centres O_(1) and O_(2) as shwon in figure with data. The friction coefficient of the two cars with the road is same. There is a finishing line at the end of the arc. Using these informations solve the following questions. Graph between the magnitude of relative velocity of the two car and time is :