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November 2 AP Physics

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Momentum Test return

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In: What makes objects move in a circle?

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**Objective: To begin our study of circular motion. Success criteria:**

Discover the variables of centripetal force, and be able to do centripetal force and acceleration problems.

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**Discovery Lab: Circular motion**

Using the circular motion device, discover everything you can about circular motion. List your discoveries:

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What did we find out?

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**Period (T) is the time it takes to go around once. **

Frequency ( f ) the number of times it goes around in one second T=1/ f

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**Centripetal acceleration**

Always toward the center ac= v2 r

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**“Center seeking” force**

Centripetal force: “Center seeking” force Fc= mv2 r

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**V=d/t Distance = 2πr Time=T (period) So……. V= 2πr T**

Tangential Speed V=d/t Distance = 2πr Time=T (period) So……. V= 2πr T

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Problem A 2.1 m rope attaches a tire to an overhanging tree limb. A girl swinging on the tire has a tangential speed of 2.5 m/s. If the magnitude of the centripetal force is 88 N, what is the girl’s mass?

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**A bicyclist is riding at a tangential speed of 13**

A bicyclist is riding at a tangential speed of 13.2 m/s around a circular track. The magnitude of the centripetal force is 377N, and the combined mass of the bicycle and rider is 86.5 kg. What is the track’s radius?

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A dog sits 1.5 m from the center of a merry-go round and revolves at a tangential speed of 1.8 m/s. If the dog’s mas is 18.5 kg, what is the magnitude of the centripetal force on the dog?

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**A 905 kg car travels around a circular track with a circumference of 3**

A 905 kg car travels around a circular track with a circumference of 3.25 km. If the magnitude of the centripetal force is 2140 N, what is the car’s tangential speed?

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Practice Problems:

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**What makes objects move in a circle?**

Out: What makes objects move in a circle?

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