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HW 5 Tips

# HW 5 Tips - HW 5 Tips PHY 131 Sect 10 11 15 Fall 2010 Prof...

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1 HW 5 Tips; PHY 131 Sect. 10, 11, 15; Fall 2010 Prof. Pascuzzi HW 5 covers Chapters 5 and 6; Uniform Circular motion & Newton s Law of Gravitation Information you may need; Important steps in solving Uniform Circular Motion problems; 1) Remember that even though the object is moving with constant speed , it is moving with a changing velocity , because the velocity vector (tangent to the circle at any point) is always pointing in a different direction. Therefore, an object moving in uniform circular motion is actually accelerating because its velocity (not speed) changes! 2) Make your FBD. 3) Apply making sure that you remember that toward the center of the circle is POSITIVE and away from it is NEGATIVE for your force vectors. (Don t forget that centripetal means TO THE CENTER, or CENTER SEEKING ). 4) WRITE OUT AND SUM THE FORCES , KEEPING YOUR SIGNS STRAIGHT then solve for any requested variables. 5) A famous type of question is when something travels fast over a circular hill .how fast can it go before it leaves the ground? The HINT is that it leaves the ground when the normal force N becomes zero (see question first below).

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