1. Unit 04 “Vertical Motion” Introduction to Problem Solving Level: Easy “Dollar Bill Activity”

3. Activity/Calculation #1: How long does it take for the dollar bill ($1) to fall out of grasp? Δy = -0.08m V i = 0m/s (dropped) New Concepts: a = -9.8m/s 2 “Acceleration due to Gravity” Gravity pulls DOWN (-) always at a rate of -9.8m/s 2 Regardless of mass, shape or size!

5. Δy = -0.08m V i = 0m/s a = -9.8m/s 2 Δt = ? Δy = V i (Δt) + ½(a)(Δt) 2 -0.08m = (0m/s)(Δt) + ½(-9.8m/s 2 )(Δt) 2 -0.08m = 0+ (-4.9m/s 2 )(Δt) 2 -0.08m = -4.9m/s 2 (Δt) 2 -4.9m/s 2 0.016s 2 = Δt 2 √ √ 0.13s = Δt

6. Activity/Calculation #2: What is your “reaction time”? Activity Directions: 1.Have a partner hold a meter stick so your two fingers are at 0 meters. 2.Your partner will drop the meter stick. 3.React as fast as you can to catch the stick with your two fingers. 4.Use this distance (Δy) to calculate your “reaction time”.

7. Δy = V i = 0m/s a = -9.8m/s 2 Δt = ? Δy = V i (Δt) + ½(a)(Δt) 2 = (0m/s)(Δt) + ½(-9.8m/s 2 )(Δt) 2 Activity/Calculation #2: What is your “reaction time”? Activity Directions: 1.Have a partner hold a meter stick so your two fingers are at 0 meters. 2.Your partner will drop the meter stick. 3.React as fast as you can to catch the stick with your two fingers. 4.Use this distance (Δy) to calculate your “reaction time”.

8. Student NameReaction Time Calculate your reaction time using the meter stick. Can you react quickly enough to catch that dollar bill?