science

Maria walks at a constant speed of 2 m/s for 8 seconds. a. Draw a speed vs. time graph for Maria's motion. b. How far does she walk?

------------- D= 2x8= 16m

Between which times is the speed zero for the motion shown on the position vs. time graph in Figure 4.16

At the origin, going fastest at constant speed

Which of the three graphs below corresponds to the position vs. time graph in Figure 4.16?

C

The runners in Figure 4.15 are racing. Predict which runner will get to the finish line of the race first.

Joel

The graph in Figure 4.15 shows the position and time for two runners in a race. Who has the faster speed, Robin or Joel? Explain how to answer this question without doing calculations

Joel because the slope is steeper

Calculate the speed of each runner from the graph in Figure 4.15.

Joel- 8.8 m/s robin- 6.6 m/s

constant speed

speed that stays the same and does not change

slope

the ratio of the rise (vertical change) to the run (horizontal change) of a line on a graph

What does the slope of the line on a position vs. time graph tell you about an object's speed?

the slope is the speed

Explain why time is an independent variable and position is a dependent variable in a position versus time graph

time is changing, position is affected by time

On a graph of position vs. time, what do the x-values represent? What do the y -values represent?

x-time, independent variable y-position, dependent variable