Physics Quiz MOTION IN ONE DIMENSION

1. Physics Quiz MOTION IN ONE DIMENSION Each question is multiple choice. Select the best response to the question by pressing the button to the left of your choice. If your answer is correct, you will hear an applause. Use the forward and backward buttons at the lower corner of the slides to advance questions. Quiz by Dr. John Dayton

2. 1. What is a vector? A. A vector is any quantity used in physics. B. A vector is any physical quantity requiring physical units. C. A vector is any physical quantity that has both size (magnitude) and direction. D. A vector is the approach you take to solve a physics problem. Quiz by Dr. John Dayton

3. 2. What is a scalar? A. A scalar is a numerical value with no physical units. B. A scalar is any number read off of a measurement device such as a scale. C. A scalar is any parameter whose value can be changed to make the outcome larger or smaller. D. A scalar is any quantity that has a numeric value but no direction. Quiz by Dr. John Dayton

4. 3. Which of the quantities below is a scalar? A. distance B. position C. velocity D. acceleration Quiz by Dr. John Dayton

5. 4. A physical quantity that is always greater than or equal to zero is called __________ . A. a scalar B. real C. positive definite D. a vector Quiz by Dr. John Dayton

6. 5. Which of the following quantities is positive definite? A. speed B. elapsed time C. distance D. all of the above Quiz by Dr. John Dayton

7. 6. Average speed is the ratio of __________ to __________ . A. displacement - total elapsed time B. position - time C. total distance - total elapsed time D. final position - initial position Quiz by Dr. John Dayton

8. 7. What is the graphical interpretation of average speed? A. Average speed between two points on a position vs. time graph is the slope of the secant line between them. B. Average speed is the average instantaneous speed found at two points on a distance vs. time graph. C. Average speed is the area under a distance vs. time graph between two points. D. Average speed between two points on a distance vs. time graph is the slope of the secant line between them. Quiz by Dr. John Dayton

9. 8. What is the graphical interpretation of instantaneous speed? A. Instantaneous speed at a point on a distance vs time graph is the slope of a line tangent to that point. B. Instantaneous speed at a point on a displacement vs time graph is the slope of a line tangent to that point. C. The instantaneous speed between two points on a distance vs time graph is the slope of a line joining the two points. D. Instantaneous speed at a point on a position vs time graph is the slope of a line tangent to that point. Quiz by Dr. John Dayton

10. 9. Does the speedometer of a car read average or instantaneous speed? A. average speed B. instantaneous speed C. it depends on the model of the car D. the speedometer actually reads velocity Quiz by Dr. John Dayton

11. 10. When are average and instantaneous speed equal? A. They are never equal. B. They are always equal. C. They are equal when there is no change in direction. D. They are equal during an interval when the instantaneous speed is constant. Quiz by Dr. John Dayton

12. 11. The change in position is called __________ . A. distance B. displacement C. velocity D. speed Quiz by Dr. John Dayton

13. 12. How are distance and displacement different? A. Distance is a positive definite scalar and has no direction whereas displacement is a vector and depends on direction. B. Distance is the magnitude of displacement. C. They are the same and are both measured in meters. D. Distance is a vector and displacement is a scalar. Quiz by Dr. John Dayton

14. 13. How are speed and velocity related? A. Average speed is the magnitude of average velocity. B. There is no relation between speed and velocity whatsoever. C. Instantaneous speed is the magnitude of instantaneous velocity. D. Speed and velocity are the same except velocity has direction added to it. Quiz by Dr. John Dayton

15. 14. On what condition are the kinematics equations of motion based? A. Only when time begins at t = 0 seconds. B. The average speed must be constant. C. The acceleration must be constant. D. The average and instantaneous velocities must be equal. Quiz by Dr. John Dayton

16. 15. How will the speed of an object be changing if its velocity and its acceleration are pointed in opposite directions? A. The speed will be decreasing. B. The speed will be increasing. C. The speed will not change since it is unrelated to velocity. D. An object that is accelerating always has an increasing speed. Quiz by Dr. John Dayton

17. 16. How many directions are there in a one-dimensional coordinate system? A. one B. two C. six D. None since a one dimensional system isn`t real. Quiz by Dr. John Dayton

18. 17. How does the "physics" of an object's motion depend on the coordinate system used to observe and measure the motion? A. The physics flips over. B. Everything goes the other way in a different coordinate system. C. If an object is speeding up in one system, it may be slowing down in another. D. The physics of motion is independent of the coordinate system used. Quiz by Dr. John Dayton

19. 18. How are vector directions specified for vectors in one dimension? A. A 1-D vector is + if it points toward +∞ or is - if it points toward -∞. B. There are no vectors in a one dimensional system. C. A 1-D vector must be + if it points to the right and - if it points to the left, in any coordinate system. D. Since there is only one dimension, all directions are the same and this does not have to be specified. Quiz by Dr. John Dayton

20. 19. What is the instantaneous acceleration of an object in free-fall at the moment it has reached the peak of its trajectory where its velocity is momentarily zero? A. 0 since it is not moving B. g downward C. g upward since it has not yet changed direction D. It depends on the choice of coordinate system. Quiz by Dr. John Dayton

21. 20. In a certain coordinate system an object in free-fall, while moving upward and slowing down, has an acceleration of +g. What is its acceleration when it is moving down and speeding up? A. +g B. -g C. 0 D. g/2 Quiz by Dr. John Dayton

22. 21. What is the average velocity of a round trip to the moon? The moon is 230,000 miles away and the trip takes 230 hours. A. 1500 mph B. 1000 mph C. 2000 mph D. 0 Quiz by Dr. John Dayton

23. 22. How does an object's velocity change while it is experiencing uniform acceleration? A. The velocity does not change since the motion is uniform. B. The velocity changes by equal amounts in equal time intervals. C. The velocity always increases during an acceleration. D. The object's average velocity changes by ever increasing amounts in equal time intervals. This is the last question of this quiz. Quiz by Dr. John Dayton

24. CONGRATULATIONS! CORRECT! RETURN Quiz by Dr. John Dayton

25. INCORRECT TRY AGAIN RETURN Quiz by Dr. John Dayton