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School Physics notes: (b) Elastic potential energy stores and calculations
TYPES OF ENERGY STORE  examples explained (b) Elastic potential energy stores & calculations Doc Brown's school physics revision notes: GCSE physics, IGCSE physics, O level physics, ~US grades 8, 9 and 10 school science courses or equivalent for ~1416 year old students of physics This page will help you with ... 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 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/s^{2} or 9.8 N/kg). Watch out for units, remember in the end to work in J, m and kg.
Q9 Energy resources, energy transfers, work done and electrical power supply revision notes index
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