Ergopedia Chapter 3

Which of the following sentences best matches the meaning of the equation d = xf − xi?

• The final position is the initial position minus the displacement.

• The initial position is the final position plus the displacement

• The displacement is the initial position minus the final position.

• The displacement is the final position minus the initial position

Which of the following are vectors?

• distance

• displacement

• position

Which graph above shows the least amount of movement?

• A

• B

• C

• D

Which of the following sentences best matches the meaning of the equation d = vt?

• The speed is the distance divided by the time.

• The time is the distance divided by the speed.

• The distance is the speed multiplied by the time.

• The distance is the speed divided by the time.

Which figure shows a driver getting stuck in the mud?

• A

• B

Two robots compete in a game of tug-of-war. The orange robot first loses ground, until x = −12 m, then gains it until x = 42 m when the blue robot loses its grip. In order to win, the total displacement of a robot must be 50 m or more. Did the orange robot win the round?

• Yes

• No

A dog starts at the origin and runs forward at 6 m/s for 1.5 s and then turns around to fetch the ball by running backward at 7 m/s for 3 s. If the dog runs back to the origin at 4 m/s, then how much time has elapsed between the start and when he returns with the ball?

• 7.5 s

• 4.5 s

• 6.5 s

• 8.5 s

The position vs. time graph above represents the motion of a foam ball after being dropped. What is the instantaneous velocity at 0.8 s?

• 25 m/s

• -25 m/s

• 20 m/s

• -25 m/s

In the position versus time graph above, how far does the object travel in the first 35 s?

• 5 m

• -5 m

• 10 m

• -10 m

A bicycle starts 50 m from an intersection. Ten seconds later the bicycle is 85 m from the same intersection. What is the slope of the bicycle’s position versus time graph 5 s after it starts? Assume constant velocity motion.

• 4.5 m/s

• 2.5 m/s

• 3.5 m/s

• 1.5 m/s