Which of the following class of forces is different from others?

Pulling of a cart

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Stretching of a coiled spring

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Kicking of a football

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Electrical force

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Solution

The correct option is D Electrical force
Pulling of a cart, stretching of a coiled spring and kicking of a football take place due to contact forces. A contact force is any force that requires contact to occur. But electrical force is a non contact force which acts on an object without coming physically in contact.

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