Enter your Name:   Enter your E-mail Address:  01. A child is twirling a toy airplane on a string a constant speed: Draw the velocity of the plane and the force that it experiences. 02. Which is the weakest of the fundamental forces? 03. A student drops a ball, and it begins to fall due to the force of gravity that the earth exerts on it. What is the equal and opposite force demanded by Newton's third Law of Motion? 04. The gravitational force between two objects (mass1 = 5 kg, mass2 = 2 kg) is measured when the objects are 10 centimeters apart. If the 5 kg mass is replaced with a 20 kg mass and the 2 kg mass is replaced with a 12 kg mass, how does the new gravitational attraction compare to the first one that was measured? 05. The gravitational force between two objects (mass1 = 10 kg, mass2 = 6 kg) is measured when the objects are 12 centimeters apart. If the distance between them is increased to 36 centimeters, how does the new gravitational attraction compare to the first one that was measured? 06. Two moons orbit the same plant at the same distance away. If the first one takes 3 months to make an orbit and the second takes 1 year, which is being subjected to the greatest gravitational attraction? 07. List the outer planets. 08. Which planet in the solar system receives the least amount of insolation? 09. Which of the following orbits is more likely that of a comet? 10. What part or parts of a comet come and go during a comet's orbit? 11. What is the Kuiper belt a source of? 12. What theory says that gravity is caused by the exchange of particles between objects with mass? 13. Suppose a scientist determines that there are only two fundamental forces in nature: the electroweak force and the b force. Which of the two current theories of gravity does this mean is true?