 # Free Fall Objectives 1.) define free fall

## Presentation on theme: "Free Fall Objectives 1.) define free fall"— Presentation transcript:

Free Fall Objectives 1.) define free fall
2.) explain that all falling objects accelerate 3.) agree that all objects fall at the same rate 4.) write the free fall equations

Free Fall

Introduction Free Fall • motion caused only by gravity
• all objects fall at the same rate - works in a vacuum: area with no air - ignores air resistance Acceleration Due to Gravity is a constant. is called g is = 10 m/s2 on surface of earth is different on the moon, but still constant

Free Fall Equations Key
vv= vertical velocity (in m/s) dv = vertical distance (in meters) g = acceleration due to gravity (10 m/s2) t = time (in seconds)

Vertical Velocity Equation

Vertical Distance Equation

Time to Fall Equation

One more free fall

Worksheet A Free Fall Equations

1.) How fast will a ball be traveling if it falls for 5 seconds?
t = 5 seconds g = 10 m/s2 • vv = gt vv = 10(5) vv = 50 m/s Data Equation Math Answer

2. An apple falls out of a tree and takes 1
2. An apple falls out of a tree and takes 1.75 seconds to strike the ground. How high was the apple from the ground? Data Equation Math Answer t = 1.75 seconds g = 10 m/s2 dv = 0.5gt2 dv = 0.5(10)(1.75)2 dv = 0.5(10)(3.06) dv = 0.5(30.6) dv = 15.3 m

Data dv = 1000 m g = 10 m/s2 Equation • t = √2dv/g Math
3. A plane drops a C.A.R.E. package to some needy people in the jungle from a height of 1000 m. How long will it take the package to strike the ground? Data Equation Math Answer dv = 1000 m g = 10 m/s2 • t = √2dv/g t = √2(1000)/10 t = √2000/10 t = √200 t = 14.1 seconds

Free Fall Equations Key: vv= vertical velocity (in m/s)
dv = vertical distance (in meters) g = acceleration due to gravity (10 m/s2) t = time (in seconds)  Vertical Velocity Steps 1. Multiply g times time  Vertical Distance    Steps 1. Square time (multiply by itself) 2. Multiply by g 3. Multiply by 0.5 Time to Fall  1. multiply dv times 2 2. divide by g 3. Press = 4. Press the square root button