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Calculating distance using spring constant, mass and velocity? (Really basic stuff )

by grbmrdj
Tags: basic, constant, distance, mass, spring, velocity
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grbmrdj
#1
Apr6-11, 04:11 AM
P: 1
Hi I have a physics exam tomorrow, and I just realized we haven't covered either impulse or spring constants, and about 1 1/2 hours left to study. From a practice exam, please someone help me out?

1. The problem statement, all variables and given/known data

A high impact crash helmet is glued onto a floor and a 5.0kg steel ball is dropped from a certain height in the helmet padding. The ball hits the helmet padding at 0.85m/s. The spring constant of the padding amterial is 35kN/m.

2. Relevant equations

distance = Force/spring constant(k)
Most likely an impulse on as well

3. The attempt at a solution

d=F/k
impulse = mv = 5 x 0.85 = 4.25
d = 4.25 / 35000 = 1.2 x 10^-4

This one is not so important:
Also, in a previous question, they gave a linear graph, at one point, N = 300 and displacement = 0.06 metres. Find the spring constant?

I got
k = f/d = 300/0.06 = 5000 N/m

Is this right? (Couldn't find the answer's to the practice exam)

Also, any tips on learning these in about 20 minutes? Thanks, and sorry for massive post.
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