Question

name: emanue
motion test
multiple choice (2 pts each)

1. a student walked home using only streets. she did not cut through any...

a. the path labeled \3\ shows the students motion.
b. the path labeled \3\ shows the students motion.
c. the path labeled \3\ shows the students reference point.
d. the path labeled \3\ shows the students distance.

1. why is it helpful to find the average speed of an object?

a. most objects dont go far enough to measure the distance.
b. we never find the average speed.
c. most objects travel at different speeds during a journey.
d. most objects move too fast to be timed.

1. speed measurements are given in units of

a. distance/time²
b. time²/distance
c. time/distance
d. distance/time

1. which units show velocity?

a. 20 h up
b. 20 km/h² down
c. 10 km/h down
d. 10 km up

1. the graph to the right shows _?

a. constant speed
b. increasing speed.
c. stopped object.
d. constant acceleration.

Explanation:

1. Displacement is the straight - line path from the starting point to the ending point. The path labeled "3" likely represents this, so it shows the student's displacement.
2. Most objects travel at different speeds during a journey, so finding the average speed helps summarize their motion.
3. Speed is defined as the distance traveled per unit time, so its units are distance/time.
4. Velocity is speed with direction. Among the options, 10 km/h down has both magnitude (10 km/h) and direction (down), so it shows velocity.
5. A straight - line distance - time graph with a non - zero slope represents a constant speed.

Answer:

1. D. The path labeled "3" shows the student's displacement.
2. C. Most objects travel at different speeds during a journey.
3. D. distance/time
4. C. 10 km/h down
5. A. constant speed