1. Place HW on your desk! Bell Ringer
Using the following graph, what is the formula for speed?
Using the following graph, what is the formula for velocity?
Distance
Time
Displacement
Time

2. d t d t Speed Velocity S V Speed = Distance Time
Velocity = Displacement
Time d S t d V t

3. The GUESS Method Substitution Solution
When solving word problems, the GUESS method is a helpful way to organize your information and show all of your work!!
Givens
Unknown
Equation
Substitution
Solution

4. Practice Problem Substitution Solution
A car is traveling at an average speed of 15 m/s for 48 seconds. How far has the car traveled?
Givens
Unknown
Equation
Substitution
Solution
Speed:15 m/s
Time: 48 sec
How far?
Distance: _____meters
Distance:
720 meters x
15 m/s x 48 s

5. Practice Problem Substitution Solution
An air plane is traveling 2218 km southeast from Chicago to Miami. If it takes the plane 2.6 hrs, what is the average velocity of the plane?
Givens
Unknown
Equation
Substitution
Solution
Given: distance 2218 km and time 2.6 hrs. Unknown: velocity. Velocity = distance/time km / 2.6 hrs. = 853 km/h

6. Practice Problem Substitution Solution
A roller blader is traveling 6 miles/hr East towards the school. If he is 3.0 miles away from the school, how long is it going to take him to get to the school?
Givens
Unknown
Equation
Substitution
Solution
Given: velocity 6 mph east and distance 3.0 miles. Unknown: time ‘how long’. Equation: time = distance / velocity. Substitution: 3.0 miles / 6 mph = 0.5 hours

7. Practice Problem Substitution Solution
Jessica travels 3 miles East to the store to buy some OHS spirit wear. She then travels 2.5 miles West to her friend’s house. The total trip takes Jessica 0.9 hrs.
What is her average speed over the entire trip?
What is her average velocity over the entire trip?
Givens
Unknown
Equation
Substitution
Solution
Given: displacement: 3 miles east and 2.5 miles west and time 0.9 hrs. Unknown: ave. speed and ave. velocity. Equation: v=d/t. Sub. Ave. speed = 5.5mi/0.9 hrs (6.11 mph), ave. velocity = .5 miles east / 0.9 hrs. = (.56 mph)

8. Bell Ringer Substitution Solution
Jessica travels 3 miles East to the store to buy some OHS spirit wear. She then travels 2.5 miles West to her friend’s house. The total trip takes Jessica 0.9 hrs.
What is her average speed over the entire trip?
What is her average velocity over the entire trip?
Givens
Unknown
Equation
Substitution
Solution

9. The GUESS Method Substitution Solution
When solving word problems, the GUESS method is a helpful way to organize your information and show all of your work!!
Givens
Unknown
Equation
Substitution
Solution

10. Review This graph shows an object that is:
moving forward quickly, speeds up, then backwards, then stops
Speeding up, stopping, slowing down and then stopping
Moving forward, stopping moving forward less quickly, and then moving backwards
Speeding up, moving at a constant speed, speeding up and then slowing down

11. If an object speeds up, this is shown on a distance-time graph as:
a decrease in the slope of the line
an increase in the slope of the line
an increase along the X- axis
an increase along the Y-axis

12. On distance – time graphs, a period of time when an object is not moving is shown as:
A horizontal line
A vertical line
the line goes back to the X-axis
The line goes back to the Y-axis

13. If an object starts to move back to where it came from, this is shown as:
a horizontal line
a vertical line
a slope upwards
a slope downwards

14. Bell Ringer
This graph shows how an object moves for 5 seconds. Which of the following statements is correct?
The object is moving for the entire 5 seconds
The object moves a total distance of 10 meters
The object is stationary for 4 seconds
The title of this graph is velocity vs. time.

15. Answers for HW 10. 14,760m 11. 30 hours 12. 1.16 hours 13. 550 miles
meters W/sec
m/s Km s
4.35 hours

16. Buggy Lab Practical Come up with a procedure. Be specific!
Need to get it initialed before you begin
Multiple trials for each data point (at least five)
(Take an average for each time)
Be sure to use the correct formula for slope
Will graph averages at each data point and use line of best fit to make a prediction.
Part of your grade will be how good your prediction is!