Lecture 10 - Todays Topics Chap 5 and 6 Dynamics and Forces...

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Nature of Mathematics
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Chapter 8 / Exercise 55
Nature of Mathematics
Smith
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Dynamics and Forces:More tension forcesApplications of Newton’s Laws Friction forces02/18/2014Today’s Topics: Chap. 5 and 6
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Nature of Mathematics
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Chapter 8 / Exercise 55
Nature of Mathematics
Smith
Expert Verified
Sec 5.7 (Some particular forces) TensionWhen a cord is attached to a body and pulled taut, the cord pulls on the body with a force T directed away from the body and along the cord. (a) The cord, pulled taut, is under tension. If its mass is negligible, the cord pulls on the body and the hand with force T, even if the cord runs around a massless, frictionless pulley as in (b) and (c).
Equilibrium: Tension in a Cable1) Draw a free-body diagram2) Draw coordinates & resolve forces3) Define direction of accelerationFor θ= 30°, what is the tension T in either cable?Wθθ
Non-Equilibrium: Penguins on IceThe four penguins that are being pulled along frictionless ice.What is the mass of the penguin that is not given?
1) Read the problem and draw a picture.2) Draw a free-body diagramshowing all EXTERNALforces acting on body.3) Draw a convenient coordinate system and resolve forces into components.4) Define direction of acceleration, if any5) Subdivide into differing systems if needed6) Write Force equations for each direction…Solve Newton’s 2nd law (vector) for each system
The four penguins that are being pulled along frictionless ice.What is the mass of the penguin that is not given?Non-Equilibrium: Penguins on Ice
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