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When a rock tied to a string is whirled in a horizontal circle, doubling the speed quadruples the tension in the string.
What is tension?
In physics, tension is defined as the pulling force that is transmitted axially by a string, rope, chain, or similar object, or by each end of a rod, truss member, or other comparable three-dimensional object.
Tension can also be defined as the action-reaction pair of forces acting at each end of the aforementioned elements.
The force produced when a load is placed at one or more of the ends of a material in a direction away from the material's cross-section is known as the tension force. It's common to describe a tension force as a "pulling" force.
Thus, when a rock is tethered to a string and spun in a horizontal circle, doubling the speed causes the string's tension to multiply by four.
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