Question 20. A block of mass M is placed on a flat surface. A force is applied to move it parallel to the surface. The frictional force f developed is proportional to the (a) square of the mass of the body (b) mass of the body (c) reciprocal of the mass of the body (d) reciprocal of the square of the body
The frictional force is directly proportional to the mass of the body. Explanation: The frictional force is a contact force that resists sliding between the surfaces...
