Tension by the string on the body always acts ________________________the body.

Q. The work done by a force on a body, over a closed loop, is not always zero.

Q. Assertion :A work done by friction is always negative. Reason: If frictional force acts on a body its kinetic energy may decrease.

Q. A body mass 8 kg placed on a smooth horizontal table is connected by a light string passing over a pulley to a hanging body of mass 2 kg. Find the acceleration of the masses and the tension in the string. $(g=10m/s^2)$.

Q. A $20kg$ body is suspended by strings $a$ and $b$ as shown.
Find the tension in $a$ and $b(20/\sqrt{3}kg$ wt. each).

Q. Assertion :Force on a body A by body B is equal and opposite to the force on the body B by A. Reason: Force in nature always occur between pairs of bodies