1. Freefall Did you watch the video? http://aplusphysics.com/courses/regents/videos/FreeFall_Regents/FreeFall_Regents.html

2. “Freefall”- an object acted upon only by the force of gravity “acceleration due to gravity” on Earth = 9.81 m/s 2 We are going to use 10 m/s 2

4. When drag is equal to weight, there is no net external force on the object and the vertical acceleration goes to zero. With no acceleration, the object falls at a constant velocity as described by Newton's first law of motion. The constant vertical velocity is called the terminal velocity. In freefall you actually don’t accelerate forever…

5. Freefall Table- Analyzing velocity and distance of an object “dropped” (v i = 0, a = 10 m/s 2 ) over a period of time. t (s)v f (m/s)d (m) 0 1 2 3 4 5 6 7 8 9 10 v f = ? What equation? 0 d = ? What equation? 0

7. Practice: A rock is dropped from a bridge over a river. How far did the rock fall after 4 s? What is the velocity of the rock 4 seconds after it is dropped?

8. Orange Review Book:

13. Throw up Problems: What goes up must come down- symmetry of motion time up = time down v i = v f Peak of motion v = 0 m/s

14. Practice: An arrow is shot vertically into the air. The arrow returns to earth 10 seconds later. – What time did it take the arrow to reach it’s highest point? – Find the arrows speed at it’s highest point. – Find the arrows acceleration at it’s highest point. – Find the speed of the arrow the instant before it lands. – What is the displacement of the arrow after it lands?