1. To maintain its orbit above Mars, will the ISS have to move faster or slower that its orbital speed around Earth? Justify your answer. 2. Will astronauts on the ISS feel lighter, heavier, or no change at all while in orbit around Mars. Explain your answer.

28. Which best describes the gravitational force? a.  linear function of distance   b. an infinite-range force c. applicable only to our solar system d.  sometimes repulsive

Describe your approach to calculating the velocity of a satellite in an orbit of radius R around the Earth. Select as many options as you think are appropriate. a. Use Newton's second law. O b. Use Kepler's second law. ☐ c. Use Newton's law of universal gravitation. d. Use Kepler's first law.

4. Drag the moon to various locations in order to determine the quantitative effect of distance upon the gravitational force. Examine the effect of doubling, tripling and quadrupling the distance of separation (as measured from planet's center). Consider the planet's surface to be a distance of one Earth-radius (1 Rplama). Use the following table to record data for whole-number multiples of Rane. Separation Force (fictional units) Distance 2 R 3 R 4 R 5 R 6 R 7 R 8 R 9 R 10 R 11 R 12 R 21.1 pianet planet pianet planet planet planet planet planet planet planet planet Use your data to complete the following sentences. If the separation distance between the moon and the planet is ... increased by a factor of 2, then the Fgrav is olecredsed by a factor of a. ...