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    dks2114's Avatar
    dks2114 Posts: 32, Reputation: 2
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    #1

    Oct 8, 2007, 06:00 PM
    Work + Elastic Potential Energy
    A 50g ice cube can slide w/o friction up and down a 30 degree slope. The ice cube is pressed against a spring at the bottom of the slope, compressing the spring 10 cm. The spring constant is 25N/m. When the ice is released, what total d will ti travel up the slope before reversing direction?

    W = (Ff + Fp ) d
    But since No friction in this problem Ff=0
    W= EPE

    Giving us:
    1250 = (0.245)d
    d=5102m



    Part 2 asks this: Let's say that the ice cube is replaces by a plastic cube whose coefficient of friction is .20. How far will the plastic cube travel up up the slope?

    W = (Ff + Fp ) d
    Plug in Ff
    W= EPE

    Giving us:
    1250 = (.049 + .245) d
    d= 4252m

    Are these correct or did I miss something?
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Oct 9, 2007, 08:41 AM
    Check your units - you're off by a factor of 10^6 in the first problem. Perhaps you may figured the spring is compressed 10 m, rather than 10 cm?
    dks2114's Avatar
    dks2114 Posts: 32, Reputation: 2
    Junior Member
    		  
    #3

    Oct 9, 2007, 10:13 AM
    That's exactly what I did... thank you!
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