Normal reaction

Statement-1 and 2 are on a situation of a frog jumping vertically up on a rigid floor. Statement-1: Due to work done by normal reaction of floor frog gains kinetic energy. Statement-2: Normal reaction by ground accelerates centre of mass of frog

Assertion: A particle of mass m takes uniform horizontal circular motion inside a smooth funnel as shown. Normal reaction in this case is not mgcostheta . Reason: Acceleration of particle is not along the surface of funnel.

Asseration : All surfaces shown in figure are smooth. Block A comes down along the wedge B. Work done by normal reaction (between A and B) on B is positive while on A it is negative. Reason : Angle between normal reaction and net desplacement of A is greater than 90^(@) while between normal reaction and net displacement of B is less than 90^(@) .

The ball of mas m moves with speed v againest a smooth , fixed vertical circular groove of radius R kept on smooth horizontal surface find the a. normal reaction of the floor or the ball. b. normal reaction of the vertical wall on the ball.

A small block is shot into each of the four tracks as shown below. Each of the tracks rises to the same height. The speed with which the block enters the track is the same in all cases. At the highest point of the track, the normal reaction is maximum in

One fourth length of a uniform rod of length 2l and mass m is place don a horizontal table and the rod is held horizontal. The rod is released from rest. Find the normal reaction on the rod as soon as the rod is released.