Sunday, February 12, 2012

What is a creative way to present free fall motion?

it can be any type or way to explain the free fall motion theory! please help mee! i really cant think of any!!What is a creative way to present free fall motion?yeaa...what they said. Its real simple, easiest way is to think of a rock falling of the empire state building. it gets faster and faster and faster as it goes down. When it reaches the bottom its gona be real fast!! Faster than you dropped it. If there wasnt grav. the rock would reach the bottom at the same speed you threw it. Gravity has an accel 9.8m/s^2...So lesson of the day DONT JUMP OFF EMPIRE STATE BUILDING before you turn off the gravity switch in my office. Call me when you needed it switched off. GluckWhat is a creative way to present free fall motion?A free-falling object is an object which is falling under the sole influence of gravity. Try strobe light demonstration. The room is darkened and a jug full of water is connected by a tube to a medicine dropper. The dropper drips water and the strobe illuminates the falling droplets at a regular rate - say once every 0.2 seconds. Instead of seeing a stream of water free-falling from the medicine dropper, several consecutive drops with increasing separation distance are seen. What is a creative way to present free fall motion?If you have a well-stocked lab, do this.



Get a large glass cylinder that has an air tight cap with an opening for a tube insertion. Through the tube, run a light thread and use it to tie a feather on the inside side of the cap. Put the cap on the cylinder, pull the feather up to the bottom of the cap, and attach a tube to the outside of the cap.



Attach the other end of the tube to a vacuum pump. Evacuate the large glass cylinder of all its air...leaving a vacuum inside. Pull the thread holding the feather until the thread breaks and the feather freefalls in the cylinder. Time the freefall drop of the feather. Repeat this experiment serveral times and calculate the average time to fall. The average will serve to minimize measuring errors.



Now, using the same cylinder, drop a marble (or similar) the same number of times and take the average. You can evacuate the cylinder if you wish, but the results will not be much different with air in it for the marble drop.



Compare the feather vs. the marble drop times. What will you see...markedly different times, pretty much the same, which one will drop fastest. etc.?



Hint: The acceleration due to gravity is fixed at g ~ 9.81 m/sec^2; what will that mean about the force of gravity on the marble (M) and on the feather (m); where M and m are the respective masses.

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