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Centripetal Force and Circular Motion

Describe when...

Question

Describe when the work done by spring force will be positive and when it will be negative in a horizontal spring mass system

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Solution

when you stretch/compress a spring the work done by spring force is negetive but
when you release the stretched/compressed spring work done by spring force is positive.

All you have to do is to identify direction of force acting and the direction in which body is displaced.

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Similar questions

Q. The work done in stretching a spring of force constant k from

y_{1}

y_{2}

from mean position will be

Q. A spring of force constant

k

is cut in two parts at its one-third length. When both the parts have same elongation, the work done in the two parts will be (Spring constant of a spring is inversely proportional to length of spring)

Q. Assertion: Work done by stretching or compressing a spring is positive.

Reason: Work done is said to be positive when force applied and displacement are in the same direction.

Q. A spring of force constant k is cut in two parts at its one-third length. When both the parts are stretched by same amount. The work done in the two parts will be:
(Note- Spring constant of a spring is inversely proportional to length of spring.)

4 k g

mass a hung vertically on a light spring that obeys Hooke's law, the spring stretches by

2 c m

. The work required to be done by an external agent in stretching this spring by

5 c m s

(g = 9.8 m e t r e s / s e c^{2})

.

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