Session_17_Powerpoint

Session_17_Powerpoint - limit? b. How far will you travel...

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PHYS 1100 Session 17 Leader – Mel Triay
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Instantaneous Kinematics Calculus – Did you really think you’d never have to use it? Position Velocity Acceleration Position Velocity Acceleration
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Key Phrases and Concepts Speeding up / Slowing down Max. / min. velocity and displacement ‘Turnaround’ points
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Example 1
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Answers to Example 1 a. 3 m/s b. Positive c. 3 m/s d. -6 m/s – decreasing e. 5 m/s f. -6 m/s g. -9 m/s
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Example 2
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Answers to Example 2 a. 5 m/s b. 73.3 m c. Never d. zero
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Practice Set 1
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Answers to Practice Set 1 a. 116i+12j b. 116i+12j c. 16i+0j d. 16i+0j
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Constant Acceleration 3 Basic Equations Tabulate all information What do you have? What do you need? Check signs – do they make sense?
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Example 3 The brakes on your car can slow you at a rate of 5.2 m/s2. If you are going 137 km/h and suddenly see a state trooper, a. what is the minimum time in which you can get your car under the 90 km/h speed
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Unformatted text preview: limit? b. How far will you travel during that time? Answer to Example 3 Example 4 A car enters a bridge going east at 5 m/s and exits at 30 m/s (assume constant acceleration). At the exact same time the first car enters, another car enters the bridge at the opposite end going westward at a constant 15 m/s. The bridge is 315 m long. a. Where do the cars meet? b. How much time has elapsed since they entered? Answer to Example 4 Practice Set 2 A hot-air balloon is floating at a stable 80 m above the ground when a package is dropped over the side. a. How long does the package take to reach the ground? b. With what speed does it hit the ground? c. At what position is its speed half of what it is when it hits the ground? Answers to Practice Set 2...
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Session_17_Powerpoint - limit? b. How far will you travel...

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