PREVIOUS QUIT NEXT START SLIDE Quiz by Dr. John Dayton Physics Quiz MOTION IN ONE DIMENSION Each...

Quiz by Dr. John Dayton

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SLIDE

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.



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1. What is a vector?

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.

A. A vector is any quantity used in physics.

B. A vector is any physical quantity requiring physical units.



SLIDE

2. What is a scalar?

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.

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.



SLIDE

3. Which of the quantities below is a scalar?

C. velocity

D. acceleration

A. distance

B. position



SLIDE

4. A physical quantity that is always greater than or equal to zero is called __________ .

C. positive definite

D. a vector

A. a scalar

B. real



SLIDE

5. Which of the following quantities is positive definite?

C. distance

D. all of the above

A. speed

B. elapsed time



SLIDE

6. Average speed is the ratio of __________ to __________ .

C. total distance - total elapsed time

D. final position - initial position

A. displacement - total elapsed time

B. position - time



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7. What is the graphical interpretation of average speed?

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.

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.



SLIDE

8. What is the graphical interpretation of instantaneous speed?

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.

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.



SLIDE

9. Does the speedometer of a car read average or instantaneous speed?

C. it depends on the model of the car

D. the speedometer actually reads velocity

A. average speed

B. instantaneous speed



SLIDE

10. When are average and instantaneous speed 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.

A. They are never equal.

B. They are always equal.



SLIDE

11. The change in position is called __________ .

C. velocity

D. speed

A. distance

B. displacement



SLIDE

12. How are distance and displacement different?

C. They are the same and are both measured in meters.

D. Distance is a vector and displacement is a scalar.

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.



SLIDE

13. How are speed and velocity related?

C. Instantaneous speed is the magnitude of instantaneous velocity.

D. Speed and velocity are the same except velocity has direction added to it.

A. Average speed is the magnitude of average velocity.

B. There is no relation between speed and velocity whatsoever.



SLIDE

14. On what condition are the kinematics equations of motion based?

C. The acceleration must be constant.

D. The average and instantaneous velocities must be equal.

A. Only when time begins at t = 0 seconds.

B. The average speed must be constant.



SLIDE

15. How will the speed of an object be changing if its velocity and its acceleration are pointed in opposite directions?

C. The speed will not change since it is unrelated to velocity.

D. An object that is accelerating always has an increasing speed.

A. The speed will be decreasing.

B. The speed will be increasing.



SLIDE

16. How many directions are there in a one-dimensional coordinate system?

C. six

D. None since a one dimensional system isn`t real.

A. one

B. two



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17. How does the "physics" of an object's motion depend on the coordinate system used to observe and measure the motion?

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.

A. The physics flips over.

B. Everything goes the other way in a different coordinate system.



SLIDE

18. How are vector directions specified for vectors in one dimension?

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.

B. There are no vectors in a one dimensional system.

A. A 1-D vector is + if it points toward +∞ or is - if it points toward -∞.



SLIDE

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?

C. g upward since it has not yet changed direction

D. It depends on the choice of coordinate system.

A. 0 since it is not moving

B. g downward



SLIDE

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?

C. 0

D. g/2

A. +g

B. -g



SLIDE

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.

C. 2000 mph

D. 0

A. 1500 mph

B. 1000 mph



SLIDEThis is the last question of this quiz.

22. How does an object's velocity change while it is experiencing uniform acceleration?

C. The velocity always increases during an acceleration.

D. The object's average velocity changes by ever increasing amounts in equal time intervals.

A. The velocity does not change since the motion is uniform.

B. The velocity changes by equal amounts in equal time intervals.



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PREVIOUS QUIT NEXT START SLIDE Quiz by Dr. John Dayton Physics Quiz MOTION IN ONE DIMENSION Each...

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