
#1
Oct1208, 02:32 PM

P: 63

A block of mass M = 2.5 kg is released from rest and slides down an incline that makes an angle q = 31° with the horizontal. The coefficient of kinetic friction between the block and the incline is ľk = 0.2.
a) What is the acceleration of the block down the inclined plane? I got a = 3.37 The next four questions are concerned with what has happened after the block slides a distance d = 6 m down the plane. b) How much work was done on the block by the Earth's gravitational force? I got Wg = 75.7878 c) How much energy was expended in overcoming the frictional force (thus producing heat, etc.)? d) What is the kinetic energy of the block? e) The plane exerts a normal force (perpendicular to its surface) on the block. How much work was done on the block by this normal force? Easy that's 0. I just can't get how to get Eheat or KE? 1. The problem statement, all variables and given/known data 2. Relevant equations 3. The attempt at a solution 



#2
Oct1208, 03:38 PM

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#3
Oct1208, 07:33 PM

P: 63





#4
Oct1208, 08:29 PM

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Mass on Inclined Plane with Friction 



#5
Oct1208, 08:36 PM

P: 63

"The next four questions are concerned with what has happened after the block slides a distance d = 6 m down the plane." Sorry about that. 



#6
Oct1208, 09:45 PM

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#7
Oct1208, 11:46 PM

P: 63

So ((2.5*9.81) sin 31)  (0.2(2.5*9.81 cos 31) = 2.5*a = 3.37 To determine friction I just calculated the normal force * uk. In terms of forces they act over the distance but not in terms of work at least for normal force. 



#8
Oct1208, 11:51 PM

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