Gravitational force is a non-contact force (also known as a field force). It acts between any two objects possessing mass, even when they are separated by a distance, without any physical contact between them (e.g., the force between the Earth and the Sun, or the force between the Earth and an object in free fall). Push force, frictional force, and strain force (which arises from interactions between atoms/molecules within a material under deformation) are all examples of contact forces.
Which one of the following is not a contact force ?
Asked in UPSC NDA 2 2016 · Topic: Mechanics (Newton's Laws of Motion and their applications)
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