Wednesday
October 22, 2014

Homework Help: Physics

Posted by Kelly on Monday, June 1, 2009 at 5:08pm.

So I'm dong a lab about simpkle harmonic motion and I have to answer questions at the end of the lab were I'm provided this question to answer

here's a step that's not the actual question but the question makes reference to it

Step 3
using the point and the scale, note the equilibrium position of your mass on the srping, pull the mass down a given distance, record it, and release the mass. Record the position that the mass rises to. Do this for each mass.

Here's a question that asked me about step 3 which is not the actual question I have but my answer helps to answer my question

How did the distance above and below the equilibrium positions compare for each of the masses in step 3?

here's the answer I wrote

When we performed step three in the procedure that when we pulled the mass spring system down 4.0 cm from the equilibrim position it went past this equilibrium position 4.0 cm. For every single different mass that was used to conduc this experiment the same thing also occuered.

HERE'S MY QUESTION

2. Using your experimetnally determined spring constant, your largest mass, and your amplitude for that mass from step 3 calculate,

a. the total energy of you srping-mass system;

b. the velocity of hte mass when it passes through its equilibrim position (E total = E kinetic)

c. The potential energy and kinetic energy of your simple Harmonic Oscillator when its displacement is half the amplitude. (x = A/2 E potential = 1/2 kx^2 & E total = E potential + E kinetic)

d. the velocity of the mass when its displacement is half the amplitude.

here's my data

largest mass = .117 kg

Amplitude = 4.0 cm
100 cm = m
(4.0 cm)/(100 cm) = .04 m

force of gravity = -.49 N

X (this distance is the x i pulled down the srping to find the observed period that i found by taking the time and dividing it by oscillations. I also had to calculate the time.) = -.01 m

spring constant k = 49 N/m

T observed = .33 s

T calculated = .20 s

Ok I don't know how to answer these questions. If you could please show me how to them step by step showing the formulas used and eveyrhting including the correct amount of sig figs that would really be great!

Also the next question asks me this

Write the equation for the motion of your simple Harmonic Pscillator form problem 2 if at t=0 it is at the top of its motion?

I'm completley lost

thanks for your time!

I had to type this whole thing in again =_=

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