Question

Which of the following types of force cannot do work on the body on which it acts?

a) Friction force
b) Elastic force
c) Gravitational force
d) none of these

Answer 1

of course no d is the best

Answer 2

Answer:

Fricton force cannot do work on the body that it acts.

Explanation:

• Friction is a force that prevents two solid objects from rolling or sliding over one another. Although frictional forces, such the traction required to walk without slipping, may be advantageous, they can provide a significant amount of resistance to motion.
• There are basically 2 types of friction forces:
  1. Static friction : When the force applied on the body is not enough to make it move it is because friction generated is of exact same amount as that of force applied on the body
  2. Kinetic friction : A force that acts between moving surfaces is referred to as kinetic friction. A force acting in the opposite direction of the movement of a body on the surface is felt. The coefficient of kinetic friction between the two materials will determine the size of the force.
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