Physics Help Forum Really confused... Piano problem

 Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

 Nov 9th 2013, 09:50 PM #1 Junior Member   Join Date: Nov 2013 Posts: 2 Really confused... Piano problem A 350 kg piano needs to be moved up the incline plane of 3.7 meters. If the angle of incline is 68 degrees, and the man pushes with a force parallel to the incline plane, and makes the piano move with an accelartion of 0.5 m/s^2. If the coefficient of friction is 0.31, what is the force exerted by the man? Honesty don't know how to try or start this problem. I have a faint idea, but still... I would appreciate some kind of help. Thank you in advance and do you fellows have any tips on how to tackle problems that deal with incline planes?
 Nov 10th 2013, 02:07 AM #2 Physics Team   Join Date: Feb 2009 Posts: 1,425 Piano on inclined plane. Since the piano is being pushed up the incline, Friction will be acting down the slope. If F is the force with which it is being pushed, this minus (the component of weight down the plane + friction) will give the net force. Divide this by m to get acceleration. Hope this helps
 Nov 10th 2013, 09:47 AM #3 Junior Member   Join Date: Nov 2013 Posts: 2 Thanks! Problem is they gave me the accelration already which is 0.5. You said in order to get the total net force it's Fman=F-(weight of piano+force of friction) I guess the weight is mg=(350)(9.8)=3430N Force of friction is Ff=(0.41)(3430)cos(68)=526N? I don't know if I'm on the right track.
 Nov 10th 2013, 11:07 AM #4 Physics Team   Join Date: Feb 2009 Posts: 1,425 Yes you are. Just plug in the value for acceleration and find F

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