Forces and elasticity Flashcards
What do stretching, compressing or bending transfer?
Energy
What you apply a force to an object what could happen?
You could cause the object to stretch, compress or bend.
How do you get an object to stretch, compress or bend ?
You need more than one force acting on the object, otherwise the object would move in the direction of the applied force instead of changing shape.
What are objects that can be elastically deformed called ?
elastic objects
What happens if an object has been inelastically deformed ?
it doesn’t return to its original shape and length after the force has been removed.
What happens when a force stretches ie compresses an object and causes energy to be transferred to the elastic potential energy store of the object ?
Work is done
What does it mean is an elastic object is elastically deformed ?
All the energy that is being transferred is usefully transferred to the objects elastic potential energy store.
What is Extension directly proportional to ?
Force
What is the extension of a stretched string directly proportional to ?
The load or force applied.
When stretching a spring what does the the spring constant depend on ?
The material that you are stretching - a stiffer spring has a greater spring constant.
What is the equation for working out the force applied to a spring when being stretched?
Force (N) = Spring constant (N/m) x Extension
F = ke
When an elastical object stops stretching what does this mean ?
The force is great enough, there is a limit to the amount of force you can apply to an object for the extension to keep on increasing proportionally.
