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PHYSICS Motion review by Jon Brumley

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PHYSICS REVIEW u THE FOLLOWING QUESTIONS PROVIDE A GOOD REVIEW TO MOTION CONCEPTS. AT THE END OF THE PRESENTATION, YOU MAY CHECK YOUR ANSWERS. IT IS SUGGESTED THAT YOU GO BACK AND CHECK THE QUESTIONS THAT YOU MISSED.

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FREE FALL u A feather and a penny fall at with the same acceleration when they are in a vacuum. Why wont they outside of a vacuum ? u A. the penny has a larger mass. u B. metal is more attracted to the Earth. u C. the feather has more air resistance.

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FREE FALL u How should you place your body to fall faster ? u A. in a spread eagle position. u B. in a ball. u C. changing your position wont make you fall faster.

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VELOCITY GRAPHS u Question: Inconsistent Ivan walks at a constant speed, stops, and then accelerates. Describe the three curves that will make up his position vs. time graph. u A. diagonal line, horizontal line, curve. u B. horizontal line, diagonal line, curve. u C. curve, horizontal line, diagonal line.

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VELOCITY VECTORS u A plane is flying with a speed of 190 Km/h, East, when it encounters a wind blowing 25 km/h, West. What will a person on the ground observe to be the planes velocity ? u A 215 km/h, East u B 165 km/h, East u C 190 km/h, East

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VELOCITY VECTORS u A boat heads across a 150 meter river with a speed of 10 m/s. The current flows at a rate of 5 m/s. What is the boats resultant velocity ? u A 15 m/s straight across u B 11.2 m/s, 26.6 degrees downstream u C 8.7 m/s, 26.6 degrees upstream

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VELOCITY VECTORS u A river is 100 meters wide. A boat heads straight across it with a speed of 10 m/s. The current of the river flows at 10 m/s. How long will it take the boat to cross ? u A 10 seconds u B 14.1 seconds u C 20 seconds

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VELOCITY-TIME GRAPHS u How can the the distance an object has traveled be found from a velocity-time graph ? u A. from the slope of the line u B. from the area under the curve. u C. by multiplying the final velocity by time.

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MOTION PROBLEMS u Joggin Joe, starting from rest, accelerates at a rate of 4.5 meters per second squared for 5 seconds. How far will he have run ? u A meters u B meters u C meters

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MOTION PROBLEMS u Spiderman accidentally falls off a 50 meter tall building while pursuing the evil Doctor Octopus. If he falls to a height of 20 meters before he is able to catch himself, what will his final speed be ? u A. 9.8 m/s u B m/s u C m/s

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VELOCITY & ACCELERATION u Describe the motion of on object which has a positive velocity but a negative acceleration. u A. speeding up, going to the right. u B. slowing down, going to the right. u C. speeding up, going to the left.

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MOTION PROBLEM u A student throws a ball upward. 5 seconds later she reaches out and catches it. How high did the ball rise ? u A 30.6 meters u B meters u C meters

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VELOCITY uAuA driver drives 50 km/h for a distance of 100 km. A second driver drives 25 km/h for 50 km and then 75 km/h for the next 50 km. Which driver will finish faster ? u A. The first driver u B. The second driver u C. They both will finish in the same time.

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LAST -- & TOUGHEST -- QUESTION u A swimmer wishes to head straight across a river. He can swim 10 m/s in still water and the current flows at a rate of 5 m/s. What should his heading be ? u A. 27 degrees upstream u B. 30 degrees upstream u C. 40 degrees upstream

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