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For more information, please see full course syllabus of AP Physics B
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Lecture Comments (3)

0 answers

Post by Jim Tang on November 23, 2015

at around 5:09, shouldnt it be m2g+T1?

0 answers

Post by Michael Taylor on October 24, 2012

You have to use that because the friction force is equal to the friction coefficient*the normal force. The normal force is equal to m2gcos(theda).

1 answer

Last reply by: Joshua Trowbridge
Sun Apr 22, 2012 1:57 PM

Post by Robert Sanchez on February 11, 2012

For one object on an incline: friction case

If Fn cancels m2gcos(Theta) then why are they used in the equation?

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Applications of Newton's Laws, Part 2: Strings and Pulleys

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  • When solving problems involving two or more objects connected by ropes (or strings), it is important to consider each object separately, determine all the forces acting on it, determine the net force, and then apply Newton’s second law.

Applications of Newton's Laws, Part 2: Strings and Pulleys

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • Atwood's Machine 0:19
    • Object Attached to a String
    • Tension on a String
    • Two Objects Attached to a String
    • Pulley Fixed to the Ceiling, With Mass M1 , M2
    • Applying Newton's 2nd Law to Calculate Acceleration on M1, M2
  • One Object on a Horizontal Surface: Frictionless Case 17:36
    • Connecting Two Unknowns, Tension and Acceleration
  • One Object on a Horizontal Surface: Friction Case 23:57
    • Two Objects Attached to a String with a Pulley
    • Applying Newton's 2nd Law
    • Tension of an Object Pulls to the Right
  • One of the Object is Incline : Frictionless Case 32:59
    • Sum of Two Forces on Mass M2
    • If M1g is Larger Than M2g
  • One of the Object is Incline : Friction Case 40:29
    • Coefficient of Kinetic Friction
    • Net Force Acting on M2
  • Extra Example 1: Two Masses on Two Strings
  • Extra Example 2: Three Objects on Rough Surface
  • Extra Example 3: Acceleration of a Block