RS U2C1A6 Turn to page137& copy the key question. “ Describing the Motion of an Object with Constant Speed”

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Presentation transcript:

RS U2C1A6 Turn to page137& copy the key question. “ Describing the Motion of an Object with Constant Speed”

slope the tilt or slant of a straight line on a graph: the rise divided by the run

slope Rise Run

9 miles (  3) = 9 miles

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

Read page 139 Calculating the Speed of an Object constant speed simulator

speed = distance traveled time elapsed Write the formula below on your Record Sheet (back of last page) speed = distance time

Now it’s your turn!

2. What is the speed of the car between 4.0 s and 10.0 s? SHOW YOUR WORK!!

Now complete #’s 3 & 4 (p.140) on your own!

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!

p 139 p 139, yellow data table

Students: Copy Graph 2 from the video Finish viewing race car video #1showing both graphs.

remains the same

Link to simulator movie: two different speedsLink to simulator movie: two different speeds (Hint: Race car vs. Plower)

slope the tilt or slant of a straight line on a graph: the rise divided by the run

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. Compare the slopes of the two plotted lines on the speed versus time graphs below.

#9. The slope of graph 5 and graph 6 is zero. No change is occurring in the speed over time. Their speed is constant!

slope Rise Run

Rise = 75 m Run = 3s

Rise = 50m Run = 10s

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.

p 143

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

How can you determine the speed of an object that has constant motion? 2 ways: 1)speed  distance  time 2)graph a distance vs. time graph and measure the slope of the line (slope = rise  run)