Application of Newton's Laws

Application of Newton's Laws - Physics 125 Discussion#7...

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Physics 125 Discussion #7 1 Problem 1: Push a Box on an Incline Plane When a force of 500 N pushes on a 25-kg box as shown in the figure below, the acceleration of the box up the incline is 0.75 m/s 2 . Friction can NOT be neglected. (1) First, let’s define our coordinate system as shown in the figure above. (2) Draw a free-body diagram for box. (Hint: there are four forces acting on the box.) (3) Find the x- and y- components of each force. (Use symbols. Let 40 0 = θ .) Symbol x-component y-component Force #1 Force #2 Force #3 Force #4 40 0 40 0 a=0.75 m/s 2 m=25kg F push =500 N x y
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Physics 125 Discussion #7 2 (4) Write out Newton’s second law in the y-direction for the box. (Use symbols!) (5) Find the normal force on the box. (6) Write out Newton’s second law in the x-direction for the box. (Use symbols!) (7) What is the kinetic coefficient of friction, μ k ?
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Physics 125 Discussion #7 3 Problem 2: Two-mass Pulley Consider the following Atwood's machine with m 2 > m 1 , and with a very light (or massless), frictionless ideal pulley. (1) First, let’s define the coordinate systems for m 1 and m 2 as shown in the figure (in which the motion of both blocks are in the positive direction). (2)
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Application of Newton's Laws - Physics 125 Discussion#7...

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