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August 29 AP physics

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In: A stone is thrown horizontally with an initial speed of 10 m/s from a bridge. If air resistance could be ignored, how long would it take the stone to strike the water 80 m below the bridge? 1 s 2 s 4 s 6 s 8 s

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**Objective: To use 2 dimensions to understand projectile motion.**

Success criteria: Be able to solve projectile problems with horizontal initial velocity

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Projectile motion

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**Video: Snowmobile projectile**

Preliminary run I noticed: Run 1 Run 2 Run 3

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**Horizontal and Vertical directions are independent.**

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**Horizontal motion has constant velocity.**

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**Vertical motion is freefall motion.**

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Divide and conquer! Horizontal Vertical Time crosses the line!

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Practice: A ball is kicked with a velocity of 20 m/s at an angle of 45o from horizontal. What is the horizontal and vertical initial velocity?

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How high will it go?

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How far will it go?

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A cannon shoots a cannon ball at 18m/s at an angle of 30o from the horizontal. What is the distance the cannonball goes?

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**Wiley Coyote slides horizontally off a 100 m cliff at 75 m/s**

Wiley Coyote slides horizontally off a 100 m cliff at 75 m/s. How far from the base of the cliff will he land?

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A bullet shoots from a gun at 200 m/s at an angle of 55o from the horizontal. How long is it in the air? How high will the bullet go? How far will the bullet travel.

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**A man jumps from a burning building 30 meters from the ground**

A man jumps from a burning building 30 meters from the ground. His initial velocity is 10 m/s at 25o from the vertical. How long did it take him to land? How far away from the building should the firemen hold the net?

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A tennis player hits a ball from 10 meters away from the net that just barely clears the .75 meter net. His initial velocity was 20 m/s. What was the angle he hit it with?

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A diver jumps off the 10 meter platform with a velocity of 8 m/s at an angle of 55o from the horizontal. What were the horizontal and vertical components of her jump. How long does it take her to hit the water?

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Out: A stone is thrown horizontally with an initial speed of 30 m/s from a bridge. Find the stone’s total speed when it enters the water 4 seconds later. 30 m/s 40 m/s 50 m/s 60 m/s 70 m/s

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Motion in Two Dimensions Chapter 7.2 Projectile Motion What is the path of a projectile as it moves through the air? Parabolic? Straight up and down?

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