World Record Free Fall After flying to an altitude of 39,045 meters (128,100 feet) in a helium-filled balloon, Felix Baumgartner  https://www.youtube.com/watch?v=FHtvDA0W34I.

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Presentation transcript:

World Record Free Fall After flying to an altitude of 39,045 meters (128,100 feet) in a helium-filled balloon, Felix Baumgartner  https://www.youtube.com/watch?v=FHtvDA0W34I

Free Fall Definition-motion under the influence of gravitational force only

Example of free fall Dropping a ball? Throwing a ball? Yes Yes, once it leaves your hand

It is a force of attraction

For medieval science, freely falling objects moved too quickly and the clocks could not record quickly enough . So Galileo devised to slow down the motion by replacing the falling object with a ball rolling down a gently inclined plane.

Up on a graph is +, down -...so g= -9.8 m/s², downward little “g” Little g is known as the acceleration due to gravity Magnitude is 9.8 Up on a graph is +, down -...so g= -9.8 m/s², downward

Physics misconception Galileo did not, as is popularly believed, state that the objects would hit the ground at the same time – he understood air resistance. He did understand that without air resistance, the objects would fall at exactly the same rate.

On the moon http://www.youtube.com/watch?v=U7db6ZeLR5s

The vertical velocity is dependent upon the time for which it has fallen and increases by 9.8m every second Time (s) Velocity (m/s) 0 0 1 9.8 2 19.6 3 29.4 4 39.2 5 49.0

All objects always accelerate at the same rate Experience tells you that objects speed up (or accelerate) as they fall All objects always accelerate at the same rate (when we ignore air resistance)

How far will an object drop? xy=x₀+v₀t+1/2at² xy= ½ gt² I drop a rock off of a bridge, and 4.2 s later, I hear a splash. What is the height of the bridge? X = ½ (9.8 m/s²) (4.2 s)² = 86 m

Free Fall with Upward Motion It experiences a downward acceleration The object spends half its time traveling up; half traveling down. At the top, velocity is 0

2) A ball is thrown upward The ball is thrown upward with an initial velocity of 10 m/s. What is it’s maximum height? v²= v₀²+ 2a(x-x₀) v²= v₀²+ 2g(x)

Free Fall with Upward Motion Homer Hickham used this fact to determine how high his rocket went  and that the rocket boys didn’t start the fire in Welch

October Sky http://www.youtube.com/watch?v=udHB3tftPz4

Myth Busters https://www.youtube.com/watch?v=PHxvMLoKRWg

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