The force applied by means of a machine is known as:
electrostatic force
frictional force
gravitational force
mechanical force
Which of the following is a contact force: (a) electrostatic force (b) gravitational force (c) Frictional force (d) magnetic force.
Which of the following is not a no-contact force ? (a) electrostatic force (b) gravitational force (c) frictional force (d) magnetic force