Application of Newton's Laws

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

This preview shows pages 1–4. Sign up to view the full content.

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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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 ?
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)

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This homework help was uploaded on 04/10/2008 for the course PHYSICS 125 taught by Professor Unknown during the Fall '08 term at University of Michigan.

### Page1 / 7

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

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online