School Physics notes: (b) Elastic potential energy stores and calculations
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TYPES OF ENERGY STORE - examples explained
(b) Elastic potential energy stores & calculations
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What is a elastic potential energy store? How solve numerical problems involving elastic potential energy? How do you explain examples of elastic potential energy ? How to use the formula and do calculations involving elastic potential energy
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Elastic potential energy and elastic potential energy stores
For more on elastic potential energy see Elasticity and energy stored in a spring - experiments and calculations
How to solve elastic potential energy store problems
You may also need the spring relationship: force = a spring constant x extension
(overlap with forces 4, need some graph based questions)
In all questions, unless otherwise indicated, you assume the limit of proportionality is not exceeded.
Q1 A spring with spring constant of 5.00 N/m is stretched for an extra 10.0 cm.
Q2 A spring has a spring constant of 2000 N/m.
Q3 It takes 5.0 J of work to stretch a spring 20 cm.
Q4 A spring stores an extra 20 J of elastic potential energy when stretched an extra 40 cm.
Q5 A stretched string has a total length of 60 cm and a spring constant of 240 N/m.
Q6 A spring is fixed firmly in a vertical position. When a mass of 120.0 g is attached to the spring it extends in length by 3.2 cm.
Q7 A spring has a spring constant of 20.0 N/m.
Q8 For this question you need to know the formula for gravitational potential energy (GPE) and gravitational field constant g = 9.8 m/s2 or 9.8 N/kg). Watch out for units, remember in the end to work in J, m and kg.
Energy resources, energy transfers, work done and electrical power supply revision notes index
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