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CollegeStudent
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Homework Statement
A mass of 122 g is attached to a vertically hung spring. The mass stretches the spring 13.8 cm. (a) What is the spring constant of the spring? (b) If the mass is dropped from rest from a position where the spring is just relaxed, what will be the maximum distance the mass will stretch the spring?
Homework Equations
W = ΔK + ΔP
Gravitational P.E = mgh
Spring P.E = 1/2kx²
The Attempt at a Solution
(a) What is the spring constant of the spring?
I used a FBD to see that the only relevant force working here would be the force of gravity...so mg.
spring constant = Force / Δx
We're given Δx = .138m
Force would be just the mg I believe...so if that is true
K = F / Δx = 1.1956 / .138 = 8.66 for the spring constant
(b) If the mass is dropped from rest from a position where the spring is just relaxed, what will be the maximum distance the mass will stretch the spring?
For here I'm not too sure...I tried using Work = Δk + ΔP
so I did
mgh (also written as mgΔy) for the gravitational potential energy + 1/2Kx² for the spring potential energy, and since velocity would be 0 the kinetic energy wouldn't apply
so
mgΔy = 1/2Kx²
I'm not sure if this is the right way to be approaching this...
any hints here?