What is “weightlessness?”

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Presentation transcript:

What is “weightlessness?” First of all, what is weight? http://video.google.com/videosearch?q=how%20do%20satellites%20work&sourceid=ie7&rls=com.microsoft:en-US&oe=utf8&rlz=1I7ADFA_en&um=1&ie=UTF-8&sa=N&hl=en&tab=wv#q=simpsons%2Bspace&hl=en&view=2&emb=0

Newton’s First Law The Falling Cup 1. What makes the liquid squirt out of the hole in the beginning? 2. Would the strength of the squirt be the same on the surface of the moon? 3. What will happen when I drop the cup? Why?

What keeps the water in place?

Newton’s Second Law Force = mass * acceleration Is the bucket accelerating? Why or why not?

Newton’s Second Law Assuming that the mass of the cup is 100 grams, what is the acceleration due to gravity at the top of the circle? Assuming that the cup rotates at a constant velocity of 4.0 m/s, calculate the Force due to centripetal acceleration.

How does all this relate to satellites? http://video.google.com/ videosearch?q=how%20 do%20satellites%20work &sourceid=ie7&rls=com. microsoft:en- US&oe=utf8&rlz=1I7ADF A_en&um=1&ie=UTF- 8&sa=N&hl=en&tab=wv #q=satellites%2Bscience &hl=en&view=2&emb=0

What does the attractive force due to gravity depend on?

F = (G*M*m) / r^2 G = M = m =

Why does a satellite stay in orbit? Due to the balance of two effects: (1) velocity, or the speed at which it would travel in a straight line, (2) the gravitational pull between the Earth and the satellite.