Elasticity

Question 1

What is deformation and the different types?

Answer 1

• When an object changes shape, we say it has been deformed
• Elastic deformation: when the object returns to its original shape
• Inelastic deformation: when the object doesn’t return to its original shape

Question 2

What is extension?

Answer 2

• The increase in length of a string when it is stretched

Question 3

What is the point after which a string no longer returns to its original shape called?

Answer 3

• Its limit of proportionality
• Its elastic limit

Question 4

What can applying a force to an object cause the object to do?

Answer 4

• Stretch
• Compress
• Bend

Question 5

What is the minimum number of forces required for an object to stretch, compress or bend?

Answer 5

• Minimum 2 forces
• Or else the object would move with the force

Question 6

What is an objects spring constant?

Answer 6

• A measure for how many newtons of force it requires for the object to be stretched by 1 metre

Question 7

What is hooke’s law?

Answer 7

• The extension of an elastic object is directly proportional to the force applie to it, up to its limit of propotionality
• F = k x e

Question 8

What are the two equations for elasticity?

Answer 8

• F = k x e
• Ee = 0.5 x k x e^2

Question 9

What does the gradient on a force-extension graph tell us?

Answer 9

• Tells us the object’s spring constant

Question 10

What does the area under the curve on a force-extension graph tell us?

Answer 10

• Elastic potential energy