A block of mass $(m=1kg)$ is released from rest over a circular curved path, as shown in diagram. The work done (in joules) by normal force, when block is displaced by $\theta ={45}^{\circ }$ is

Q. A block of mass $(m=1kg)$ is released from rest over a circular curved path, as shown in diagram. The work done (in joules) by normal force, when block is displaced by $\theta ={45}^{\circ }$ is

Q. A block of mass $1kg$ is pulled along the curve path $ACB$ by a tangential force as shown in figure. The work done by the frictional force when the block moves from $A$ to $B$ is

Q. A light inextensible string that goes over a smooth fixed pulley as shown in the figure connects two blocks of masses $0.36kg$ and $0.72kg$. Taking $g=10m/s^2$, find the work done (in joules) by the string on the block of mass 0.36 kg during the first second after the system is released from rest.

Q. A block is released from rest from top of a rough curved track as shown in the figure. It comes to rest at some point on the horizontal part. If its mass is $200g$, calculate the negative of work done (in joules) by friction.

Q. A block of mass m is released from top of a smooth fixed inclined plane of inclination $\theta$. Find out work done by normal force.