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Projectile Motion. Projectile Motion. Feeding the Monkey (Banana Gun). Where does the zookeeper aim if he wants to hit the monkey? ( He knows the monkey will let go as soon as he shoots ! ). Feeding the Monkey. r = r 0. If there were no gravity, simply aim . at the monkey. r = v 0 t.

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## Projectile Motion

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**Projectile Motion**Projectile Motion**Feeding the Monkey(Banana Gun)**• Where does the zookeeper aim if he wants to hit the monkey? • ( He knows the monkey willlet go as soon as he shoots ! )**Feeding the Monkey...**r = r0 • If there were no gravity, simply aim at the monkey r =v0t**Banana hits**monkey! Feeding the Monkey... r= r0 - 1/2 g t2 • With gravity, still aim at the monkey! r= v0t - 1/2 g t2**Projectile: An Object Moving Solely Under Influence of**Gravity**Independence of x & y Motions**For Vx= 5 m/s**Projectile Trajectories**Complementary angles have equal ranges**Satellite Motion**• If superman threw a rock fast enough … it would orbit the earth (if there were no air resistance**Satellite = Fast Projectile**• Since the earth’s surface curves away from the horizontal by 5 m for every 8000 m tangent to the surface • V = 8000 m/s = 8 km/s**Satellite Periods**• For a satellite close to the Earth, the period (the time for a complete orbit about the Earth) is about 90 minutes. • For higher altitudes, the orbital speed is less, distance is more, and the period is longer. • For example, communication satellites located in orbit 5.5 Earth radii above the surface of the Earth have a period of 24 hours.

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