Elasticity and Hooke's lawIB MYP Physics: Flashcards

What these 13 flashcards ask

What is extension?
State Hooke's law.
Write the equation for Hooke's law, with units.
What is the spring constant?
A spring extends 4 cm under a 2 N force. What is k?
What does the gradient of the straight part of a force-extension graph give?
What does the straight line through the origin tell you?
What is the limit of proportionality?
What is the elastic limit?
What is elastic deformation?
What is plastic deformation?
What type of energy is stored in a stretched spring?
How do you convert 8 cm to metres for F = kx?

Exam questions on Elasticity and Hooke's law

A trampoline manufacturer in Melbourne joins the mat to the frame with steel springs. Each spring has a natural length of 20 cm. In a test, a weight of 12 N is hung from one spring and its length becomes 26 cm. The spring is not stretched beyond its limit of proportionality.
The same spring is stretched by a weight of 18 N. Calculate the extension in cm.2 marks
A workshop technician in Kuala Lumpur tests a steel spring by hanging increasing loads from it. Up to 15 N the extension is directly proportional to the load and the spring returns to its original length when the load is removed. A load of 25 N takes the spring beyond its elastic limit.
Explain what happens to the length of the spring after (i) a 10 N load is removed and (ii) the 25 N load is removed.2 marks
A student in Vancouver hangs loads from a spring and measures the extension each time. A 2.0 N load gives an extension of 4.0 cm, a 4.0 N load gives 8.0 cm, a 6.0 N load gives 12.0 cm, an 8.0 N load gives 16.0 cm and a 10.0 N load gives 22.0 cm.
Calculate the spring constant of the spring in N/m using the first four results.3 marks

Written by the Exaim team, led by Shaun Daswani (Head of Upper Secondary, Improve ME Institute; MSc Financial Mathematics, Imperial College London; BSc, UCL) and Jason Daswani (operational lead, Improve ME Institute; LSE).