Hewitt Drew-It! PHYSICS Screencasts
Projectile and Satellite Motion

13. Sideways Drop
(Bullseye Bob drops a bullet while firing another horizontally, then analyzed in Paul’s televised classroom, followed up with vertical and horizontal motion independence.)
End Questions: What is Phil’s pitching speed? How fast does the ball leave his hand?
And a second question: How fast does the ball hit the ground?

14. Ball Toss
(Paul shows how the motion of a ball tossed by Phil Physiker can be carefully analyzed, with interesting distinctions.)
End Question: How will a force-of-gravity vector appear at position C? Will it be the same size? Or not? And for that matter, how would it appear at all the positions shown

15. Tennis-Ball Problem
(Paul shows the solution to finding the maximum velocity of a horizontally-moving tennis ball that barely clears the net to remain in the court.)
End Question: If the net were a little higher, would the maximum speed for the ball be a little less, or a little more, than 26.6 m/s?

49. Satellite Speed
(Paul shows how a satellite’s orbital speed in close Earth orbit relates to Earth’s curvature.)
End Question: Why does a satellite in a circular orbit maintain a constant speed? And tie this to your answer as to why a bowling ball rolling along an alley also has a constant speed. Both the satellite and the bowling ball are pulled downward by gravity. So why don’t they speed up? Why does gravity not increase their speeds?

50. Circular/Elliptical Orbit
(Paul distinguishes circular and elliptical orbits with force vectors for each.)
End Question: What becomes of the component of force along the direction of the satellite’s path when the satellite is closest to, and farthest from, Earth?