Elasticity Flashcards
1
Q
What is deformation and the different types?
A
- 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
2
Q
What is extension?
A
- The increase in length of a string when it is stretched
3
Q
What is the point after which a string no longer returns to its original shape called?
A
- Its limit of proportionality
- Its elastic limit
4
Q
What can applying a force to an object cause the object to do?
A
- Stretch
- Compress
- Bend
5
Q
What is the minimum number of forces required for an object to stretch, compress or bend?
A
- Minimum 2 forces
- Or else the object would move with the force
6
Q
What is an objects spring constant?
A
- A measure for how many newtons of force it requires for the object to be stretched by 1 metre
7
Q
What is hooke’s law?
A
- 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
8
Q
What are the two equations for elasticity?
A
- F = k x e
- Ee = 0.5 x k x e^2
9
Q
What does the gradient on a force-extension graph tell us?
A
- Tells us the object’s spring constant
10
Q
What does the area under the curve on a force-extension graph tell us?
A
- Elastic potential energy