Steel Work Table
13 May 2010
Steel Work Table
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Tricky work calculation problem - general physics?
I'm having a lot of issues figuring out how much work is done in this problem:
How much work must you do to push a 10kg block of steel across a steel table at a steady speed of 1.0 m/s for 3 s? (The answer has been given to be 176 J)
I'm not sure how to go about this. If it's moving at a steady speed, doesn't that mean that there is no acceleration and therefore no net force in the x direction? If that's true, shouldn't there be no work? I'm really confused. Can somebody please help me?
There is no NET force, but there is a frictional force in opposition to the force you apply to it. In general, W = F*d
In this case F = frictional force = µ*Fn = µ*m*g = µ*10*9.8 = 98*µ
d = V*t = 1 m/s * 3s = 3 meters
Ergo, W = F*d = 98µ*3 = 294*µ Joules
You HAVE to know µ to do this problem......
If you somehow know that the work W = 176 J, then you can work back to find µ: µ = W/294 = 176/294 = 0.6
