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Flipped Learning Exercise - Material Properties As when we first started the topic of potential dividers, we are going to look at the topic of Material Properties in a manner slightly different to normal, with another flipped learning exercise. Remember, learning in this way has a number of advantages. ● You develop a genuine and deep understanding of the topic because you have to think it through for yourself. ● Your teacher is at hand when you are doing questions and get stuck. ● It’s the type of learning method common at university - so it’s useful to get a taste of it now! Before next lesson complete the tasks below, using the resources sign-posted for you. For tasks 1 and 2, you will need a pen and A4 paper to make some notes as you go along. When you watch the Prezi and read the textbook, you need to decide what is important and should be noted - don’t just try to copy everything down! Task 1. Physics website Prezi On the physics website, go to page 3.2 Material Properties. (a) Read through the Learning Outcomes – make sure you know what you are supposed to learn! (b) Work your way through Prezi 3.2.A – Describing Materials, Hooke’s Law & the Young Modulus. Make notes on key points. When you have completed these tasks, move on to the digital textbook Task 2. Digital textbook on Kerboodle Access the textbook from http://www.aquinasphysics.com/kerboodle.html Read pages 73 to 83 (sections 4.1, 4.2 & 4.3). Make additional notes to supplement your notes from Task 1. Task 3. Complete this booklet Use your rough notes from the first two tasks to complete the following questions in this booklet. Task 4. Homework 3.2.A Mechanical Properties of Materials Properties Complete the Warm-Up Questions (A), (B) and (C).
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3.2.A Material Properties
Part A: Notes on qualitative properties of materials. For each of the following, write the definition and then add some useful notes. Elastic behaviour (elasticity)
Definition: Notes
Plastic behaviour (plasticity)
Definition: Notes
Brittle behaviour
Definition: Notes
Ductile behaviour
Definition: Notes
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3.2.A Material Properties
Malleable
Definition: Notes
Hard
Definition: Notes
Tough
Definition: Notes
Stiff
Definition: Notes
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3.2.A Material Properties
Strong
Definition: Notes
Part B: Correcting misconceptions. Each of the terms above have a very specific meaning. However, they are commonly applied incorrectly in everyday use, a trap you will need to quickly overcome. Correct the statements below. • a builder tries to bend a ceramic tile and finds she cannot deform it. She comments “This tile is strong!” What term should she have used? • a hoodie-wearing teenager tries to graffiti one of the bus stops on the A6 by scratching the glass with a piece of metal. He fails. “Crikey!” he comments. “This glass is really tough! Respect to Stockport Council for choosing high quality materials”. What term should he have used? • a student confidently states in class: “Brittle materials are really easy to break”. The teacher gives an exasperated sigh, and starts to explain why this is wrong. What do they say, and what examples could they give to put this ill-informed numpty in his place?
Part C: Notes on quantitative descriptions of material behaviour. Hooke’s Law
Explanation
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Equation: F
=
3.2.A Material Properties
Spring Constant, k
What are it’s units?
Equation: k
=
What does the value for the spring constant tell you? What material property from part A does the spring constant describe?
Stress, s
Definition:
Equation: s =
Notes:
Strain, e
Definition:
Equation: e
=
Equation: E
=
Notes:
Young Modulus, E
Definition: Notes:
Why is the Young Modulus a better description of material property than the spring constant?
Aquinas College Physics
3.2.A Material Properties
Elastic Strain Energy, Eel
Definition:
Equation: Eel
=
Notes (including how do you find it from a graph of force against extension):
Fracture Stress
Definition: Notes (including which of the properties from part A this describes)
Yield Stress
Definition: Notes
For the lesson Bring your rough notes, the completed topic booklet and the homework questions to your next physics lesson. Be prepared to answer questions in class! Aquinas College Physics
3.2.A Material Properties