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09_17_Problem_Solving

# 09_17_Problem_Solving - What is its velocity just before it...

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9/17 Problem Solving / Text examples from chapter 2 and 3 / Exam I Thursday, 9/20 5-7 p.m. Wit 116 / No HW assigned today Choose problems from the text to do. Avoid those that give a, x, and one of the v’s. / Lab: “Kinematics”

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From 9/5 Displacement, x (distance moved) Instantaneous Velocity, v (at a particular time) Average Velocity, v ave (average over time) Change in Velocity, v (speeding up or slowing down) Acceleration, a (how much the velocity changes each second)
Projectile Motion Example 1: An object is thrown straight up with a velocity of 4m/s. The acceleration is 9.8m/s 2 directed down. How long is the object in the air? How high does it get? What is its velocity when it gets back to the ground?

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Projectile Motion Example 2: An object is dropped from rest from a height of 45m above the ground. The acceleration is 9.8m/s 2 directed down. How long is the object in the air?

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Unformatted text preview: What is its velocity just before it gets to the ground? a ∆ v ∆ t v ave ∆ x ∆ t v f 2 ∆ v 2 ∆ x ∆ t 2 a Projectile Motion Example 3: A ball rolls off a table that is 45m above the ground. The acceleration is 9.8m/s 2 directed down. The initial velocity of the ball is 10m/s right. How long is the object in the air? (same as previous) What is its velocity just before it gets to the ground? Projectile Motion 3-25 v o = 135m/s at 15 ° above/below the horizontal. What is the velocity, magnitude and direction, just before it hits the ground? Note: drawing is not perfectly accurate. Acceleration is 9.8m/s 2 down. Find initial components Find ∆ t to the highest point Find ∆ x to the highest point Add this to 2000m Find ∆ t to fall from highest point Find ∆ v y from highest point (this is v fy )...
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09_17_Problem_Solving - What is its velocity just before it...

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