Free Fall Constant Acceleration in the ydirection Warmup

Free Fall = Constant Acceleration in the y-direction

Warm-up: Tuesday, 2019 -09 -23 1. When I tripped down the stairs, your teacher fell 15 cm downwards. The acceleration of gravity is -9. 8 m/s 2. For how long was she falling? Assume she started at an initial vertical velocity of 0 m/s. 2. Wil E. Coyote was falling for 20 s. How tall was the cliff? 3. Challenge: A six-year throws its stuffed bear as high possible. It is in the air for a total time of 6 s. How far did the stuffed bear go?

Reaction Time 1. You will be working with a partner. 2. Hold your fingers about ~ 3 cm apart with the meter stick in between. 3. Your partner will drop the meter stick without any warning. 4. Record Δy = ruler caught – initial ruler height 5. vo=0 m/s, and ay=-9. 8 m/s 2; what is your reaction time? 6. Do this 3 x to find an average. 7. Switch with your partner, so both of you get your own data. Jump Height 1. Question: What is the difference between the height you measure, and the height you calculate? 2. This will be done in groups of four. 3. Have a member of the group jump as high as possible. Have one person time, and another with a meter stick to measure the height. 4. Calculate time÷ 2 Δy=vot+(1/2)at 2 where vo=0, and a=-9. 8 m/s 2 5. Do 3 x to get an average measured height and average calculated height. 6. Find percent difference = 100 x[(measured-calculated)/calculated]