forces & elasticity

Created by

Libby Wishart

Cards (15)

what can you cause when applying a force to an object?
compress, stretch, bend
why do you have to apply more than one force to get an object to compress, stretch or bend? 
it will just move as you pull or push it
what are the two types of deformation?
elastic and inelastic
what does elastic deformation mean?
the object will return back to its original shape after the two forces have been removed
what does inelastic deformation mean?
the object doesn't return to its original shape and stays deformed after the two forces have been removed
what is extension? 
the increase in length of a spring when its stretched
how can we measure extension?
hang a spring from a solid support
measure the springs natural length before adding any weights
add weight and measure the new length
subtract the natural length from the weighted length to get the extension
why does the spring not fall down from the solid support when the weights are added?
it exerts an equal but opposite force upwards meaning its being perfectly balanced by the support
what happens as we increase the force on a spring (e.g. adding more mass)
the extension increased proportionally
what is the spring constant?
exactly how much the spring extends
what dos the spring constant tell us?
how many newtons it would take to stretch the object by 1m
the higher the spring constant the _______ the material because it requires more force to stretch it
higher
what is hookes law?
the extension of the spring is directly proportional to the force applied to it (the more force you apply to the spring the further it stretches) the spring will return back its its original shape (elastic deformation)
when does hookes law no longer apply?
when the elastic limit (limit of proportionality) is reached and the object won't go back to its original shape meaning it will have been inelastically deformed.
what is elastic potential energy?
energy transferred to an object as its stretched