Free fall is a state of falling free from air resistance and other forces except gravity.

1. Free Fall • Free fall is a state of falling free from air resistance and other forces except gravity.

2. For Free Fall... (a) you drop an object from rest at t=0. (b) velocity acquired = acceleration ´ time v = g t (c)

3. Example Multiple-Choice Questions1. The two measurements necessary for calculating average speed are (a) acceleration and time. (b) velocity and time. (c) distance and time. (d) distance and acceleration.

4. 2. What is the average speed of a horse that gallops a distance of 10 kilometers in a time of 30 minutes? (a) 10km/h (b) 20km/h (c) 30km/h (d) more than 30km/h

5. 3. What is the acceleration of a car that maintains a constant velocity of 100km/h for 10 seconds? (a) 0 km/h s (b) 10 km/h s (c) 10 m/s2 (d) 1000 km/h s

6. 3. What is the acceleration of a car that accelerates from rest to 100km/h in 10 seconds? (a) 0 km/h s (b) 10 km/h s (c) 10 m/s2 (d) 1000 km/h s

7. 6. Dan drops a stone down a well and sees it hit the water 4 seconds later. Neglecting air resistance, how deep is this well? (a) 9.8 m (b) 19.6 m (c) 78.4 m (d) 156.8 m (e) 39.2 m

8. 7. Dan drops a stone down a well and sees it hit the water 4 seconds later. Neglecting air resistance, what is the speed of impact of the stone? (a) 9.8 m/s (b) 19.6 m/s (c) 4.9 m/s (d) 78.4 m/s (e) 39.2 m/s

9. Velocity = {speed with a direction}

10. g = 9.8 m/s2 downward

11. Free Fall v = g t