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5-3 A Car Rounding a Curve•An example of centripetal
acceleration occurs when an automobile rounds a curve.
•When you round a curve, you feel pushed out, but there is no force pushing you out, you are showing
inertia…the seat (by friction) and/or the door (by contact) exert an inward
force on you.
See Example 5-7
•F=ma= mv2 /r •to solve skidding curve problems.
Cars on a banked curve…
• FN =sin F = m v2 / r• See Example 5-8 page 121
5-4 Nonuniform Circular Motion
• Circular, uniform motion occurs when the net force is exerted towards the center of the circle…when the net force is a blend of linear and centripetal acceleration, this is nonuniform circular motion.
See example 5-9 page 122
• Remember…forces and resultant accelerations have the same direction…see the diagram p 122.
• Use atan = Dv/Dt and ac =v2 /r and the addition of vectors in combination with the Pythagorean theorem to solve nonuniform circular motion problems.
Homework due Monday BOP
•Page 140 10-14, 17,22-23