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An: We know that three friends often met at the café because they used to sit on their usual seats by the window.

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Answer:

Whenever there is an interaction between two objects, there is a force upon each of the objects. When the interaction ceases, the two objects no longer experience the force. Forces only exist as a result of an interaction.

Frictional Force: Gravitational Force

Normal Force: Magnetic Force

Tension Force: Electrical Force

Contact Forces: Action-at-a-Distance Forces

Explanation:

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