Sept. 9 – Speed and Velocity

We continued with where we left off yesterday:

Displacement: a change in position.

Question: If I travel from Halifax to Vancouver, what is my displacement?

Vancouver is 3350 km West of Toronto.

Halifax is 1260 km East of Toronto.

Answer:   

                       = 3350 km [WEST] – 1260 km [EAST]

                       = 3350 km [WEST] – 1260 km [-WEST]

                       = 3350 km [WEST] + 1260 km [WEST]

                       = 4610 km [WEST]

Notice we can rewrite EAST as negative WEST!

SPEED is the change in distance over time.

                                       

VELOCITY is the change in displacement over time.

(Velocity is a VECTOR)

                                       

Then we went out into the hallway and measured the speed of a medicine ball as it rolled down the hall.  Here's our set up:

And here are the results from the first class:

and the second class:

Here's the handout on the activity:

• Kinematics Lab 1: Rolling a Ball

Homework

• Complete the lab handout
• Complete day 0 homework from the Unit Outline: P. 13 #1-4, 6, 7

Announcement

• There will be a FORMATIVE QUIZ tomorrow!