Energy Spring Force & Elastic Potential Energy.

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Presentation transcript:

Energy Spring Force & Elastic Potential Energy

Figure 6.5a

Figure 6.5b

Figure 6.6

The slope of the F vs Δx graph is called the spring constant (k) The slope of the stiffer spring 2 is larger (33 N/m) than the slope for spring 1 (20 N/m). This means that to stretch spring 1 by 1m, we would only need to exert a 20-N force, but would need a 33-N force for spring 2.

Figure 6.7a

Figure 6.7b

Hooke’s Law If any object causes a spring to stretch or compress, the spring exerts an elastic force on that object. If the object stretches a spring, the force that the spring exerts is

Scenario: A person pulls a spring horizontally to stretch it.

How much work did we do to stretch the spring?

The amount of work done on the spring is the area under the F-vs-x graph Positive work done on a spring, through stretching or compressing the spring, transfers elastic potential energy (Us) into the spring

The elastic potential energy of a spring-like object with a spring constant k that has been stretch or compressed a distance Δx from equilibrium is Just like any other type of energy, the unit of elastic potential energy is the joule (J).

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Unnumbered Figure Page 208