Elasticity Flashcards
How may an object change shape when a force acts on it?
By bending, stretching or compressing
How many forces must be acting to change on a stationary object to change the shape of it?
More than one
What are the ways a stationary object change shape (direction)
Bending an object ends past each other, pull an object ends apart or pushing objects ends together
What is another word for the changing shape?
Deformation
When is elastic deformation reversed?
When a force is removed
What is inelastic deformation
When the change in shape isn’t fully reversed when the force is moved as there is a permanent change in shape
What is extension
The way the length of an elastic object changes when you stretch or compress it
What is extension directly proportional to
Force
What is spring constant
The measure of the stiffness of a spring
When a force compresses or extends a spring where is work done
To the elastic potential energy in the spring
Elastic potential energy equation
0.5 x spring constant x extension squared
When does extension happen
When an object increases in length
When does compression happen
When an object decreases in length
What is spring constant measured in
Newtons per metre
What is extension measured in
Metres
What is hookes law
Force= spring constant x extension
What does the higher the spring constant mean
The stiffer the spring
What is the elastic limit
The furthest point a material can be stretched or deformed whilst being able to return to its previous shape
What is elastic potential energy measured in
Joules
Describe the practical for the relationship between force and extension. Of a spring
Secure a clamp stand to the bench using a G clamp or a large mass on the base, use bosses to attach two clamps to the clamp stand, attach the spring to the top clamp and a ruler to the bottom clamp, adjust the ruler so that is vertical and with its zero level with the top of the spring, measurement record the unloaded length of the spring, hang a 100 g mass carrier from the spring and record the new length of the spring, repeat this until you have added a total of 100 g
