User Name Remember Me? Password

 Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum Oct 2nd 2014, 03:13 PM #1 Junior Member   Join Date: Oct 2014 Posts: 1 Problem about Physics I got this problem: A wedge of mass m = 36.1 kg is held in place on a fixed plane that is inclined by an angle θ = 21.3° with respect to the horizontal. A force F = 302.3 N in the horizontal direction pushes on the wedge, as shown in Figure 4.25a. The coefficient of kinetic friction between the wedge and the plane is μk = 0.159. Assume that the coefficient of static friction is low enough that the net force will move the wedge. http://semmedia.mhhe.com/physics/bau...dge/index.html basically what's there except friction would be the other way around (since its accelerating up the slide. I did a free body diagram and got: Summation of forces in y: Normal force = mg sin theta + Appliedforce sin theta Then for the forces in x: mgcos + friction - Aplliedforce sin = 36.1a I did solve for everything but strangely the acceleration gives me acceleration = 3.2 Can any1 help me if im doing something wrong? Like getting cos and sin mixed?   Oct 3rd 2014, 07:52 AM #2 Physics Team   Join Date: Jun 2010 Location: Morristown, NJ USA Posts: 2,352 In the y-direction (vertical direction, with positive up) the normal force is Ncos(theta), weight is -mg, the applied force is 0, and the friction force is umg sin(theta). In the x-direction with positive to the right the normal force is N sin(theta), weight is 0, applied force is -F, and friction is -umgcos(theta). Now try it again.  Tags physics, problem Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Physics Forum Discussions Thread Thread Starter Forum Replies Last Post burgess Kinematics and Dynamics 2 Jul 16th 2014 04:30 AM RIGDON Kinematics and Dynamics 2 Sep 9th 2013 06:38 PM rjsci13 Kinematics and Dynamics 3 Sep 22nd 2009 02:37 AM rjsci13 Kinematics and Dynamics 3 Sep 16th 2009 01:19 PM rjsci13 Kinematics and Dynamics 1 Sep 16th 2009 12:18 AM