Tension force refers to an object being pulled tight from both ends. Think about pulling a rope or string.
This type of force is only exerted if the string is taut. Grasp the two ends of the string, and pull them so the
string is taut. How does this force, the tension force, differ from elastic force?

Elasticity is the ability of a body to resist a distorting influence and to return to its original size and shape when that influence or force is removed. Solid objects will deform when adequate forces are applied to them. If the material is elastic, the object will return to its initial shape and size when these forces are removed.

Tension may be described as the pulling force transmitted axially by the means of a string, cable, chain, or similar one-dimensional continuous object, or by each end of a rod, truss member, or similar three-dimensional object; tension might also be described as the action-reaction pair of forces acting at each end of said elements. Tension could be the opposite of compression.

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the independent variable, or the one that is intentionally manipulated is the speed.

f=ma newton's second law 7x8=56n