Practical 4 - Determination of Young Modulus of a metal in the form of a wire Flashcards
How do we plot the graph in this practical?
Applied load along the y-axis
Extension along the x-axis
What goes along the y-axis?
Applied load (F)
What goes along the x-axis?
Extension
Which formula can we use for calculating the Young modulus using a graph?
E = gradient x l
—
A
How do we calculate the area of the wire?
πr^2
What do we need two of in this practical?
2 wires - 1 test wire and 1 comparison wire
What should be similar between the test wire and the comparison wire in this practical and why?
They should be made of the same material so that temperature changes will have the same affect on both
Describe the features of the test wire and explain why
-should be as thin as possible
-should be as long as possible
(To obtain a measurable extension)
How do we obtain a measurable extension in this practical?
-using a wire as thin and as long as possible
What does using a wire as thin and as long as possible give us in this practical?
A measurable extension
What is set up to measure the extension of the test wire?
A vernier arrangement
What does the vernier arrangement do in this practical?
Measure the extension of the test wire
What are the wires hanging off of?
A support beam
What’s attached to the comparison wire and why?
A small fixed weight to keep the wire straight
How do we keep the comparison wire straight?
Attach a small fixed weight
