11/20 – 12/1/17 (Blue Free Fall, Gravity)

Here are the most important screen shots from the last ten days. Remember, you can print out and tape into your notebook any of these and their captions:

: Timestamp: OU wins the Big 12 Championship and heads for the Final Four.

: Equation we used to determine the acceleration due to gravity at the stadium.

: stadium data

: stadium data

: stadium data

: stadium data

: Read the digits left to right

: a couple of the rules for sig figs.

: What is NOT significant.

: an example

: an example

: how to show ten with two siggies.

: We tried to use the $700 set up to determine g to a more accurate value, but we didn’t get very good data.

: using 3rd orange to determine g.

: Dr. Witten brought in a $50,000 Gravimeter and we measured the true g of room 807. We found different numbers for the east side vs. west side.

: You pay a lot of money for your kmeasuring instrument to have those extra siggies.

: Percent Difference is when you are trying to determine how far apart two measured numbers are. Neither one is considered “correct”.

: When you KNOW the correct value (like 9.81m/s/s), you use this formula to see how far off your measured value is.

: Eratosthene’s determined the circumference of the earth in 240BC.

: Newton’s Universal Law of Gravitation. One of the top three equations ever written.

: Cavendish experiment proved Newton correct 100 years later and determined big G (Universal Gravitational Constant) to 4 or five siggies.

: Why field forces drop off as the square of the distance between to objects. Its like a flashlight gets dimmer and dimmer the further you take it from the object you are looking at.

: Gravity doesn’t stack up very well to the other three fundamental forces. Yet is dominates on large scales and large distances.

: How much force does the Earth hold the moon with.

: my weight in Newtons

: It’s a little early for this, but it came up in one class.

: you would weigh a little less (a tenth of a pound?) because of the inverse square law.

: Isaac Newton figured out how fast you would have to go to orbit the Earth.

: turns out its around 17,500 mph. This is how fast the ISS orbits the earth.

: Where our moon came from

: Poor Orpheus.

: the world have rings!

: The moon does not orbit the center of the earth. It (and the earth orbits the center of mass of the system. (this occurs about 1000km below the earth’s surface.