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PHC2test2006

# PHC2test2006 - PHYSICS HONORS CHAPTER 2 TEST LINEAR MOTION...

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PHYSICS HONORS CHAPTER 2 TEST: LINEAR MOTION VERSION 1 Questions 1-8 are worth 10 points each. Question 9 is worth 20 points. Write answers using three significant figures. Use scientific notation for answers larger than 100 and less than 0.10. Include magnitude and direction for all vectors. Assume all vertical motion occurs on the Earth. avg x v t = Δ Δ r r avg v a t = Δ Δ r r [ ] 2 9.81 g m s down = f o v v at = + ( 29 1 2 f o x v v t = + 2 1 2 o x v t at = + 2 1 2 f x v t at = - 2 2 2 f o v v ax = + The motion of an object toward the north is plotted on the velocity-time graph shown at right. 1) a) Briefly describe, in general terms, the motion of the object. b) Briefly describe the instantaneous acceleration of the object as it moves, and explain how it can be determined from this graph. Be specific. c) Briefly explain how the total displacement of the object can be determined from this graph. Be specific. A car changes velocity from an initial value of 12.0 m/s to the right to a final value of 5.00 m/s to the left. The change in velocity takes 6.00 s to complete. 2) What is the displacement of the car during this time? A boy standing at the edge of a cliff throws a rock straight up into the air at time t = 0. The rock has an initial speed of 10.0 m/s. 3) At what time t is the rock a vertical distance of 45.0 m below its starting point? A track star has just completed her race, and is traveling at 6.50 m/s to the right. She uniformly accelerates to a stop as she runs an additional 25.0 m to the right. 4) What is her acceleration as she comes to a stop? An airplane begins to accelerate at 3.00 m/s 2 to the north. After one minute of acceleration, the airplane has moved 16.0 km. 5) What was the velocity of the airplane after the one-minute acceleration? The driver of a car sees a dog run into the street ahead of him, and he hits the brakes. The car skids to a stop over a distance of 110 m as the brakes accelerate the car at 6.50 m/s 2 . 6) How fast was the car moving when the driver hit the brakes? You are looking at a data table containing velocity and acceleration data for a moving object. There is a range of times for which both the velocity and the acceleration of the object are negative.

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