Understanding Elastic Potential Energy Concepts
Explore the concepts of elastic potential energy, kinetic energy calculations, storing energy, and rearranging equations with practical examples and self-assessment tasks to deepen your understanding of the topic.
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Elastic Potential Energy Do now activity: 1. How do we calculate kinetic energy? 2. What are the units for: Mass Energy Speed Keywords Stores Weight Kinetic Elastic potential 3. If a car was travelling at a speed of 50m/s and it had a mass of 300kg, what would it s kinetic energy store be?
Progress indicators GOOD PROGRESS: State the kinetic energy and elastic potential energy calculations To be able to use apply the kinetic energy and elastic potential energy calculations to a problem OUTSTANDING PROGRESS: To be able to rearrange and apply both kinetic energy and elastic potential energy calculations to a problem
Think > Pair > Share: Can you think of any objects which might be a store of elastic potential energy?
Elastic Potential Energy stores
How would you rearrange this? Spring constant (k) = 2Ec e2 Extension (e) = 2Ec k
Task: Copy and complete this table: Extention2 (metres)2 Elastic Potential Energy (Ek) (J) Spring Constant (N/m) x spring constant (N/m) Extension (metres) 5 2 6 45 150 6 23 80 45 18 36 24
Self-assess your work: Extention2 (metres)2 Elastic Potential Energy (Ek) (J) Spring Constant (N/m) x spring constant (N/m) Extension (metres) 10 5 2.5 2 4 6075 6 3 45 2025 2700 150 75 6 36 73,600 23 11.5 80 6400 7290 45 22.5 18 324 10368 36 18 24 576
Quick Check Questions: Quick Check Questions: Show your working!!! 1. If a spring had a spring constant of 25N/m and it was extended by 56m, what is the elastic potential energy store of the spring? 2. If an elastic band has a spring constant of 4N/m and it was extended by 20m, what is the elastic potential energy store of the elastic band?
Task: Have a go at these questions in silence, show your work for each question:
Self-assessment: x 20Nm x 0.05m2 = 0.025J x 525Nm x 0.15m2 = 5.9J 20J / 0.12 = 2000 Nm
Plenary: Exam-style question 1. Look at the following object, in each case the object has had it s shape changed. A B C D a) Out of the objects above, which one/s do you think are storing elastic potential energy? Explain your answer. Mark scheme: A or D, because the object will go back to it s original shape/size (3)
