Speed vs. Velocity

Agenda 9/8 Go over quiz and labs Go over buggy lab Speed vs. Velocity

Post Buggy Lab Describe the motion of the buggy using speed, distance and time. What is the slope of the graph? What are the units of the slope of the graph? What is the equation of the line of your graph? Describe what the slope of the line on the graph means.

What does the slope of the following graphs tell us about the car’s motion? Distance (m) Time (s) Distance vs. Time Time (s) Displacement (m) Displacement vs. Time

Speed and Velocity Distance (m) Time (s) Distance vs. Time Time (s) Displacement (m) Displacement vs. Time

Speed vs. Velocity Speed Velocity Describes how fast an object moves Distance traveled in a certain time m/s Velocity Describes how fast an object moves in a particular direction Displacement traveled in a certain time m/s and DIRECTION

Speed vs. Velocity (What’s the difference?) Constant velocity means constant speed with no change in direction

Graphing Constant Motion Constant Velocity: when an object travels the same amount of distance in the same amount of time. Position Time Position Time

Constant Speed If something is moving at a constant speed, it means we expect a constant increase in distance over time. Time is increasing to the right, and distance is increasing steadily with time. It moves at a constant speed.

Constant Speed If something is not moving, a ________ line is created. This type of line has a slope of _________, which indicates a speed of ________.

Bell ringer (9/9) What do you like/Dislike about each table? 1 2 3 4

Refresher Describe the motion of each graph.

Constant Speed Both the lines show that each object moved the same distance, but the steeper line got there before the other one. A _________________________ indicates a ___________ speed.

Constant Speed When an object’s _________________ increases, the slope of the line increases. Is this object accelerating? Or is speed changing instantaneously?

Constant Speed What is occurring in this graph?

Worksheet on interpreting graphs

How Fast & which Direction How Far & which Direction How Fast Bell Ringer (9/12) Match the following words to their definition: Speed Displacement Distance Velocity How Far How Fast & which Direction How Far & which Direction How Fast

Go over Homework

Displacement vs. Time Graphs Position Initial Position Final Position Direction of Travel Total Distance Traveled Displacement Velocity Displacement Time

Graphing Constant Motion Constant Velocity: when an object travels the same amount of distance in the same amount of time. Displacement Time Displacement Time

Velocity vs. Time Graphs t (s) V (m/s) (+) (-) Velocity vs. Time Graphs Velocity Tells velocity at each time interval Tells Direction of travel Away from origin (+) Towards origin (-) What does a (+) slope mean? What does a (-) slope mean?

Displacement Time Displacement Time Time Velocity Time Velocity

Velocity vs Time Graphs t (s) d (m) V (m/s) (+) (-) t (s) d (m) V (m/s) (+) (-)