Projectile Motion. Projectile: An Object Moving Solely Under Influence of Gravity.

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Presentation transcript:

Projectile Motion

Projectile: An Object Moving Solely Under Influence of Gravity

Horizontally Launched Projectile

Projectile Motion

Projectile Velocities

Net Force in Freefall Horizontal Motion Vertical Motion Net Force NO YES – force of gravity – downward Acceleration NO YES – “g” is downward at about 10 m/s/s Velocity Constant Changing by about 10 m/s each second

Independence of x & y Motions t (s)V y (m/s)Y (m) t10 t5t 2 X (m) vxtvxt For V x = 5 m/s

Projectile Launched at Angle

Projectile Launched at Angle - 2

Monkey Zookeeper

Monkey – Zookeeper – No Gravity

Monkey Zookeeper - Fast

Monkey – Zookeeper - Slow

Projectile Trajectories Complementary angles have equal ranges

Satellite Motion l If superman threw a rock fast enough … it would orbit the earth (if there were no air resistance

Satellite = Fast Projectile l Since the earth’s surface curves away from the horizontal by 5 m for every 8000 m tangent to the surface l V = 8000 m/s = 8 km/s

Satellite Periods l For a satellite close to the Earth, the period (the time for a complete orbit about the Earth) is about 90 minutes. l For higher altitudes, the orbital speed is less, distance is more, and the period is longer. l For example, communication satellites located in orbit 5.5 Earth radii above the surface of the Earth have a period of 24 hours.