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# 24-09-10 - o The m a g nitud e of th e force is called th e...

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Friday, September-24-10 - Newton’s law (II) - Chapter 5, problems 20,25,27,57,69 - Free body diagrams o Shows the forces acting upon a body o Pick one object, what ever the forces are exerting themselves on o Draw all external forces which act directly on the object Gravity, contact, electromagnetic o Indicated the direction of the acceleration of the object but remember mA is not a force – but mg is applicable - Example: free-body diagram o A block is pulled up a frictionless ramp Title, to indicate the chosen object Contact forces, to replace the rope and the ramp Gravity doesn’t require contact A may be indicated for reference, but is not a force Figure 1.1 - Ropes and pulleys o A rope att ach ed to so m ething exerts a force parallel to the rope

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Unformatted text preview: o The m a g nitud e of th e force is called th e tension of th e rope o Tension is uniform in a rope of n e gligible m a ss o The tension is not cha ng ed if th e rope p a ss es over a nd ide al pulley(frictionless a n m a s sless) o Tensions h a s units of force( n ewtons ) Figure 1.2 o Example about the amount of forces in the diagrams There 4 forces o Quiz 1 The forces acting on the student and the bucket are • Gravity • Tension of the rope of the rope on the bucket • Tension of the rope that the student pulls on • Tension is the same at the both tends of the rope if the rope is ideal and the pulley is ideal...
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24-09-10 - o The m a g nitud e of th e force is called th e...

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