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# Pre-AP Physics Projectile Motion and Equilibrium Review

By Kyle Peters,2014-03-17 22:23
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Pre-AP Physics Projectile Motion and Equilibrium ReviewAP,PreAP,and

Pre-AP Physics Projectile Motion and Equilibrium Review

1. A stone is thrown from the top of the building upward with an initial speed of 24 m/s at an angle of 30.0º to the horizontal. The height of the building is 48 m. a. how long is the stone in flight?

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v

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a

b. what is the magnitude and direction of the stone's velocity just before it hits the ground?

2. A girl runs at a speed of 3.9 m/s off a high dive and hits the water 1.8 seconds later.

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v

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a

a. How high was the diving board?

b. How far horizontally was she from the board when she hit the water?

c. How long would it have taken her to hit the water if she had simply stepped off the board with no significant horizontal velocity, less time, more time, or the same amount of time?

3. A rock is thrown horizontally from a building at 15 m/s. It hits the ground 45 m from the base of the building. Just how high was this building?

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a

4. A football is kicked from ground level at a speed of 20. m/s at an angle of 42?.

a. How long does it take to hit the ground?

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a

b. How far from does it land from where it was kicked?

5. The crossbar of a football goalpost is about 3.5 m above the ground. A field goal kicker kicks a football with a speed of 20.0 m/s toward the goalpost at an angle of 37? above the horizontal. He is 32 m away from the goalpost. Is the attempt good? If not, by how much does he miss? If so, by how much does the football clear the crossbar?

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a

6. A daredevil is shot out of a cannon at 45.0? to the horizontal with a n initial speed of 25.0 m/s. A net is positioned at a horizontal distance of 50.0 m from the cannon from which it is shot. At what height above the cannon should the net be placed in order to catch the daredevil?

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a

7. A 430N force acts due North (90.0;), and a 310N force acts due West (180;)

a. What is the resultant (force and angle) of these two forces?

b. What is the equilibrant (force and angle)?

8. Three puppies are playing tug of war with one of your favorite tennis shoes. The black lab is pulling on the shoe with 55 N of force at 85;. An Australian shepherd is

pulling with 75 N of force at 135;. If the shoe is in equilibrium, where is the third puppy (a beagle) pulling, and how much force is he exerting?

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