Session_16_Powerpoint

# Session_16_Powerpoint - Tabulate all information – What...

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PHYS 1100 SI Session 16 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
Key Phrases and Concepts Speeding up / Slowing down Max. / min. velocity and displacement ‘Turnaround’ points

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Example 1 If a particle's position is given by x = 4 - 12 t + 3 t 2 (where t is in seconds and x is in meters), a) What is its velocity at t = 1 s? b) Is it moving in the positive or negative direction of x just then? c) What is its speed just then? d) Is the speed increasing or decreasing just then
Answers to Example 1 a. -6 b. Negative c. 6 d. Decreasing e. -6 f. 3.633, 0.367 g. 6 h. 6

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Example 2
Answers to Example 2 a. 7 m/s b. 47 m/s c. 101.3 m/s d. Never e. 30 s

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Practice Set 1
Answers to Practice Set 1 i. -203i+6j ii. -203i+6j iii. -26i+0j iv. -26i+0j

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Constant Acceleration 3 Basic Equations

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Unformatted text preview: Tabulate all information – What do you have? – What do you need? • Check signs – do they make sense? Example 3 A certain particle is observed moving in a straight line. It accelerates from rest in the direction of motion at 1.22 m/s2. a. How far does it move while accelerating from rest to 10 m/s? b. How much time does it take to travel 190 m? c. If it travels half a minute, what is its final position? Answer to Example 3 a. 41.0 m b. 8.20 s c. 549 m Example 4 Answer to Example 4 a. 10.77 s b. 215 m Practice Set 2 Consider a tennis ball falling from a 400 m building. a. What is it’s speed when it is halfway down? b. How long does it take to reach the bottom? c. What is its speed when it gets to the bottom? Answer to Practice Set 2 a. 62.6 m/s b. 9.03 s c. 88.6 m/s...
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Session_16_Powerpoint - Tabulate all information – What...

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