Which one of the following is not a contact force?
- frictional force
- buoyant force
- air resistance
- viscous force
- gravitational force
The Correct Option is
Approach Solution - 1
Contact forces are those that arise from physical contact between two objects, such as friction, air resistance, viscous force, and buoyant force. Gravitational force, on the other hand, is a non-contact force. It acts at a distance between objects with mass, such as between the Earth and an object on its surface.
The correct option is (E) : gravitational force
Approach Solution -2
Gravitational force is not a contact force. It acts at a distance without physical contact between the objects involved.
The other forces listed — frictional force, buoyant force, air resistance, and viscous force — all arise due to contact between bodies.
Answer: gravitational force
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