Select Physics Topics

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Contents

Cover

TOC(Table of Contents)

Topic 1

Topic 2

Topic 3

Topic 4

Topic 5

Topic 6

Topic 7

Topic 8

Topic 9

Topic 10

Topic 11

Topic 12

Topic 13

 

 

Topic 2
Gravity

Candles burning in air:  normal gravity on left and zero gravity at right.  SOURCE Click Here.

TEST DRIVE A SPACESHIP IN A GRAVITATIONAL FIELD
 (IPAD Compatible JavaScript Simulation.)

 

 

Click R1 "Isaac Newton" and read about Newton and gravity. See how Newton used knowledge of trajectories and the Moons orbit to develop inverse square law of gravitation.

 

Read  "Your Weight on Other Worlds".  Instead of your weight you can use unity and easily calculate gravitational acceleration(g) on other planets.

See "NSSDC's General Public Page" Read "Planetary Fact Sheets" on at least two planets.

General Theory of Relativity and Gravity
"One way to think about space-time is as a large fishing net. Left unperturbed and stretched out flat, it is straight and regular. But the minute one puts a weight into the net, everything bends to support that weight. A weight that was spinning would wreak even more havoc with the net, twisting it as it spun. The mass-energy of the planet earth represents a "weight" in our net of space-time, and the daily revolutions of the earth, according to Einsteinís theory, represent a twisting of local space-time. GP-B will search for this twisting effect, which has never before been measured." from Gravity Probe B  The Relativity Mission.

 

 

Suggested exercise:
Calculate the acceleration of gravity (g) on a planet using data from R6 "Planetary Fact Sheets" and use g to determine your weight on that planet. Use R4 "Your Weight on Other Worlds"  to calculate your weight on selected planet. Compare calculator results to your answer. 

 


Source Click Here
These people are in a plane not a space capsule. Which of the following is true.  A. Gravity is absent in this plane. B. The plane is in freefall. C. The pilot is forcing the plane to follow a freefall trajectory.

Answer Bottom of Page

Answer: C

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