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ISP209s9 Lecture 9 -1- Vector Problem Which of the following is not a vector: A. Position B. Velocity C. Mass D. Force E. Momentum Vectors have a magnitude (60 mph) and direction (East). Scalars have only a value (4 kg).

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ISP209s9 Lecture 9 -2- Clicker?: Picture of the flight of a ball vs. time A B C D E Where is speed the smallest, A, B, C, D, or E? The answer is C. The slope (and hence speed) is zero there. Time (s)
ISP209s9 Lecture 9 -3- Clicker: Acceleration is Rate of change of Velocity What time is the acceleration the largest? A) 1 s B) 2 s C) 2.5 s D) 6 s E) it is not possible to tell The slope is the largest at C.

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ISP209s9 Lecture 9 -4- Clicker: Vector Problem Jane is running east with a speed of 2 m/s. When she gets directly south of Susan, she throws the ball at 2.8 m/s. What direction should she throw the ball so Susan catches it? A B C D E Jane Susan

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Unformatted text preview: + ? = Hint: want D is the answer ISP209s9 Lecture 9-5-Clicker: Newton’s Laws Problem When the space shuttle is in orbit, what can we say about the force the shuttle exerts on the Earth? Choose the best answer. A. It is the same as the force the Earth exerts on the shuttle. B. The Earth pulls harder on the shuttle. C. The shuttle pulls harder on the Earth than the Earth does on the shuttle. D. None of these statements is correct. E.There is no force on the Earth since the shuttle is in orbit. ISP209s9 Lecture 9-6-Clicker Question • Why is an astronaut in orbit weightless? A). Because they are always in free fall, but constantly miss the Earth. B). Because gravity from the Earth and moon cancels. C). Because gravity from the Earth and Sun cancels. D). Because there is no gravity in space....
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