HOU Outline 4

# HOU Outline 4 - Ruchi Sharma February 9, 2008 History of...

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Ruchi Sharma February 9, 2008 History of the Universe MW Professor King Week 4: Review Questions: 1. How does Speed differ from Velocity? Speed is the distance traveling over a certain amount of time, whereas velocity is the speed and direction of the object. 2. What is acceleration? What is acceleration of gravity? Acceleration is the change of velocity of an object, either in speed or direction. Acceleration of Gravity means the acceleration of a falling object, 3. What is momentum? How is momentum affected by force? What do we mean when we say momentum will be changed by a net force? Momentum is an object’s mass and velocity. By force, an object is forced to change its velocity, as long as the mass remains the same. The Net Force causes an object to accelerate. 4. What is free fall, and why does it make you weightless? Free Fall is the falling of objects without resistance, or without anything slowing you down. 5. State Newton’s Three Laws of Motion, and for each give an example. Look Below. 6. What are the laws of conservation of momentum, conservation of angular momentum and conservation of energy? Look Below 11. Summarize the Universal Law of Gravitation. 1. Every mass attracts every other mass through a force called gravity. 2. The strength of the gravitational force attracting any two objects is directly proportional to the products of their masses. 3. The strength of gravity between the two object decreases with the square of the distance between their centers. The gravitational force follows an inverse square law with distance. 13. What do we need to know if we want to measure an object’s mass with Newton’s version of Kepler’s Third Law? Explain. Allows us to measure the orbital period and distance and also shows the relationship between the orbital period and the averhae distance depdns on the masses of the orbiting

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objects. When an object is much less massive than the object it orbits, we can calculate the mass of the central object from the orbital period and the average distance of the orbiting object. We can use Newton’s version to calculate the masses throughout the universe. It allows us to calculate the Mass of the Sun from the Earth’s orbital period and its average distance from the Sun. 18. Would you fall at the same rate on Earth as on Moon? No, since the gravitational pull is different and the orbital rate and distance is different as well. 29. Which of the following describes an object accelerating? © A car going in a circular path at a steady 100 m/s 30. Suppose you visit another planet, (b) your mass would be the same, but your weight would be different. 32. “There is no gravity in space,” T/F 33. If you want to make a rocket turn left, you have to (a) Fire an engine that shoots out gas to the left. 34. Earth’s angular momentum when it is at perihelion in its orbit is
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## This note was uploaded on 04/07/2008 for the course SCIENCE T07.6020.0 taught by Professor Caseyking during the Spring '08 term at NYU.

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HOU Outline 4 - Ruchi Sharma February 9, 2008 History of...

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