The document discusses freefall and projectile motion. It states that all objects accelerate at the same rate, 9.81 m/s^2, when falling near the Earth's surface, so heavier and lighter objects hit the ground at the same time when dropped from the same height. An example problem is shown of calculating how long it takes a person thrown off a roof falling 200 meters to hit the ground. Real-life examples of projectile motion in sports and everyday events are provided. The difference between projectile motion and freefall is explained, as well as the importance of treating the x and y axes independently in projectile problems.

1. Projectiles Freefall And

2. Freefall Even if an object is heavier than another, it will fall at the same rate as a lighter object.

3. Acceleration during Freefall As long as you are close to Earth, ALL objects have the same value of acceleration (9.81 meters per second^2) during freefall. This means that if two objects are dropped at the same time from the same height (neglecting air resistance), they will hit the ground at the same time. a=9.81m/s^2

4. Example Freefall Problem Mrs. Glazenburg decided that she was fed up with David, so she threw him off of a roof that was 200 meters above the ground. How long did it take David to hit the ground? Step One -Write out your knowns Step Two -Find the formula Step Three -Input knowns/solve Vi= o m/s d=Vit + 1/2at^2 200m=om/s t + ½(9.81m/s^2)(t^2) d= 200 meters 200m=4.905t^2 a= 9.81 m/s^2 40.77=t^2 t= ? sqrt40.77=t t=6.39 seconds

5. Real life Applications Freefall applies to many occurrences in life: If an object falls vertically downward in a vacuum tube Moon Orbiting around the Earth Projectile Examples in Life: -In Sports: Tiger Woods’s golf ball flying through the air. Brett Favre’s Pass thrown down field. Pedro Martinez’s Pitch. -In Life: A bullet being shot. An arrow fired.

6. Projectile Vs. Freefall A ball thrown horizontally will hit the ground at the same time as a ball that is dropped vertically at the same time from the same location. Why? Because X motion is independent from Y motion, and since the accelerations of both are the same (9.81m/s^2) they will both hit the ground at the same time.

7. X-Axis and Y-Axis in Projectile Problems In Projectile problems, the y-axis and x-axis are independent of each other because they have different motions, therefore should be treated separately. To insure this is accounted for, one should make a table with the x-axis coefficients on one side and the y-axis coefficients on the other side.