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Gravitational Theory

written by: jenn454
 
Let's see how much you know about the force that keeps us bound to earth.

Question 1:


English physicist, mathematician, and astronomer Sir Isaac Newton presented his findings on the universal law of gravity in his work commonly referred to as "Principia Mathematica," which was published in what year?
1535
1720
1477
1687

Question 2:


According to gravity laws, if a bowling ball and a feather are dropped simultaneously from the same height the bowling ball will hit the ground first because it has greater inertia. (In this case we ignore the effects of air resistance.)
False
True

Question 3:


The gravitational force on the surface of the Sun is greater than the gravitational force on Earth's surface. If you weigh 180 lbs or 80 kg on Earth, what would your weight be on the Sun?
1100 lbs (500 kg)
440 lbs (200 kg)
5022 lbs (2270 kg)
2770 lbs (1260 kg)

Question 4:


Free-fall is defined as a condition in which a falling object experiences acceleration due only to gravity. Therefore, in this case, the only weight acting on an object is its own weight. Which of the following is not an example of an object in free-fall?
A space shuttle with the rockets off
The Earth's orbit around the Sun
A feather falling through a vacuum tube
A skydiver with an open parachute

Question 5:


Sir Issac Newton's theories on gravity were further developed by Einstein. Einstein's theory of gravity, published in 1915, is known as: "General ________" also know as "Theory of _______."  (place mouse pointer over ? icon to view hints or answer requirements)


Question 6:


Although gravity has been a subject of much research and scientific work, the actual cause of gravitational forces remains unknown.
False
True

Question 7:


Although Newton's and Einstein's theories are generally widely accepted and used in many fields of science, there are some researchers who have developed alternative theories of gravity. Which of the following is one of these theories?
Brans-Dicke Theory
Electromagnetic Theory
Special Relativity Theory
Quantum Field Theory

Question 8:


An object in free fall towards the Earth experiences acceleration in velocity due to gravity. This acceleration has what approximate value?
8.1 meters per a second squared (26.6 feet per a second squared)
32 meters per a second squared (9.8 meters per a second squared)
9.8 meters per a second squared (32 feet per a second squared)
26.6 meters per a second squared (8.1 feet per a second squared)

Question 9:


If we measure the acceleration due to gravity at the top of Mount Everest, it will be less than the acceleration at sea level.
False
True

Question 10:


Artificial gravity is a simulation of gravity in outer space. There are several means by which artificial gravity can be created. Which of the following is not one of them?
Acceleration
Magnetism
Field generators
Rotation

 
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