Sept. 17 – Acceleration and VT graphs

Announcements

• Projected day of test: Oct. 1
• Lab as been postponed to next week.
• We are looking for teams to compete in the McMaster Engineering and Science Olympics!
  Come to room 121 after school on Thursday if you are interested in competing!  check out the website: http://olympics.mcmaster.ca/

Acceleration

Watch this....

Describe the motion of the cars in the drag race.

  - At the beginning, the speed was slow.

  - At the end, the speed was very fast

  - There was a change in speed

• Uniform motion = constant velocity = no acceleration
  
• Non-Uniform motion = velocity is not constant = acceleration

A change in speed can be written as:

              ∆v = v(final) – v(initial)

This change takes time, ∆t.

We call this rate of change acceleration.

          a = ∆v / ∆t

Example: A Ferrari 458 can go from 0.0 km/h to 100. km/h in 3.4 seconds.  a) What is its acceleration?   b) How long will it take to reach its maximum speed of 325 km/h.

Next we followed up on what we did yesterday, rolling the ball down the hill.  I followed along the instructions on the handout:

• Kinematics Lab 2: Rolling a Ball Down a Hill

Here are my notes based on Period 5 data.

I explained what a tangent line is and how to create a VT graph based on the DT graph.

You can now do homework from Day 4 in the Unit Outline.

Homework

•  Pg. 40 #1-7