RS U2C1A6Turn to page137& copy
the key question.
“Describing the Motion of an Object with Constant
Speed”
1. If Amy starts from her house and rides her bike to Alex’s house, what would be the distance she traveled?
7 miles
+3 -(-4) = 7 miles
speed = distance traveled
time elapsed
Write the formula below on your Record Sheet (back of last page)
speed = distance
time
3. Ephraim walks to his job every day. His workplace is located 2 km (2000 m) from his home. He takes 20 min (or 1/3 hour) to get to work. How fast is he walking?: Give an answer in both meters per minute (m/min) and kilometers per hour (km/h).
SHOW YOUR WORK!
4. In the distant future, Rachel flies a single-person, high-speed spacecraft between Earth and the Moon.
Once she gets out of Earth’s atmosphere, Rachel makes the 384,000 km trip in exactly 1000 s. How fast
is Rachel moving? SHOW YOUR WORK!
8. Compare the slopes of the two plotted lines on the distance versus time graphs below (graph 3 and graph 4)
The line for graph 3 is steeper than the line for graph 4. The slope is _________ for graph 3, and the slope is ______ for graph 4.
#9. The slope of graph 5 and graph 6 is zero. No change is occurring in the speed over time. Their speed is constant!
The line for graph 3 is steeper than the line for graph 4. The slope is 25/1 for graph 3, and the slope is 5/1 for graph 4. Graph 3 has a greater slope- 25/1 is greater than 5/1.
Be careful- look at the scale! Each block= 5 units on the y axis (rise).
Pick two points where the x and y intersect.
rise= 15 m
run= 5 s
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