Review Worksheet

Topics: Force, Friction, Velocity Pages: 12 (5215 words) Published: September 8, 2011
Page 1 1. If you are driving 90 km/h along a straight road and you look to the side for 3.0 s, how far do you travel during this inattentive period? a. 30 m b. 25 m c. 50 m d. 75 m A polar bear starts at the North Pole. It travels 1.0 km South, then 1.0 km East, then 1.0 km North to return to its starting point. This trip takes 30 min. What was the bear's average velocity? a. 0 km/h b. 0.10 km/h c. 3.0 km/h d. 6.0 km/h Can an object's velocity change direction when its acceleration is constant? a. No, this is not possible because it is always speeding up. b. No, this is not possible because it is always speeding up or always slowing down, but it can never turn around. c. Yes, this is possible, and a rock thrown straight up is an example. d. Yes, this is possible, and a car that starts from rest, speeds up, slows to a stop, and then backs up is an example. A car with good tires on a dry road can decelerate at about 5.0 m/s2 when braking. If the car is traveling at 55 mi/h, how much time does it take the car to stop? a. 9.8 s b. 2.5 s c. 11 s d. 4.9 s An object starts from rest and undergoes uniform acceleration. During the first second it travels 5.0 m. How far will it travel during the third second? a. 5.0 m b. 15 m c. 25 m d. 45 m An object is moving with constant non-zero velocity in the +x axis. position versus time graph of this object is a. a horizontal straight line. b. a vertical straight line. c. a straight line making an angle with the time axis. d. a parabolic curve. The







An object is thrown upward with a speed of 14 m/s on the surface of planet X where the acceleration due to gravity is 3.5 m/s2. What is the speed of the object after 2.0 s? a. 5.6 m/s b. 7.0 m/s c. 14 m/s d. 21 m/s When she reaches terminal

10. A skydiver jumps from a high-flying plane. velocity, her acceleration a. is essentially zero. b. is in the upward direction. c. is approximately 9.8 m/s2 downward. d. is a constant pointing upward.

11. A ball is thrown upward at a velocity of 19.6 m/s. after 3.00 s? a. 9.8 m/s upward. b. 9.8 m/s downward. c. zero d. 19.6 downward.

What is its velocity

12. A ball is thrown vertically upward with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the second ball go than the first ball?) a. 4:1 b. 2:1 c. 1.7:1 d. 1.4:1

Page 3 13. A ball is thrown straight up with a speed of 36.0 m/s. take to return to its starting point? a. 3.67 s b. 7.35 s c. 11.0 s d. 14.7 s How long does it

14. Two objects are thrown from the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit the street? a. The one thrown up is traveling faster. b. The one thrown down is traveling faster. c. They are traveling at the same speed. d. It is impossible to tell because the height of the building is not given. 15. A ball is thrown straight up, reaches a maximum height, then falls to its initial height. As the ball is going up, a. both its velocity and its acceleration point upward. b. its velocity points upward and its acceleration points downward. c. its velocity points downward and its acceleration points upward. d. both its velocity and its acceleration points downward. 16. A ball is thrown straight up with an initial speed of 30 m/s. its speed after 4.2 s? a. 11 m/s b. 30 m/s c. 42 m/s d. 72 m/s What is

17. A brick is dropped from the top of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks. a. The first brick accelerates faster. b. The second brick accelerates faster. c. The two bricks accelerate at the same rate. d. It is impossible to determine from the information given. 18. The slope of a position versus time graph...
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