1. Free Fall A.Free Fall: i.An object moving under the influence of gravity in 1-D (vertical direction).

2. B. Predictions: i.A regular piece of paper and a crumpled up piece of paper are drop at the same time. ii.A ping pong ball and a bowling ball are dropped at the same time from the same height. iii.A bowling ball with a ping pong ball resting in the thumb hole is dropped.

3. C. Free Fall Acceleration: i.Acceleration due to gravity ii.Same for all objects neglecting air resistance. iii.Symbol: “g” iv.Value: -9.8m/s 2 (for close to the earth) v.Value changes based upon the law of gravitation (chapter 4).

4. D. Kinematic Equations: i.All 1-D equations apply. Apply these changes: ii.Acceleration = g iii.Displacement = Δy

5. E. Free Fall Problem #1 (Dropping Problem): 1.A ball dropped from rest. 2.The above situation can also involve a ball thrown downward. V i is NOT equal to Zero

6. F. Free Fall Problem #2 (Up and Down Problem): 1.A ball is thrown upward to its maximum height and is allowed to fall back down. (2 situations)

7. Free Fall TIPS REMEMBER your signs Recall the relationships between t up and t down in our two situations Recall the relationships between V iup and V fdown

8. Free Fall Challenge Problem A ball is dropped from a height of 75ft.  Calculate the time it takes for the ball to hit the ground  Calculate the velocity just before it strikes the ground.  Now suppose a truck is driving and we want the ball to land in the bed of the truck? If the truck is traveling at 10mph, then at what distance does the car need to be from the impact pt. when the ball is to be dropped?