Physics12Fall2010

FRIDAY, SEPTEMBER 10, 2010

For the start of the class, we went over one of the worksheets that was given out the yesterday that didn't have the answers.

[Please see Amy's post for the original sheet].

We worked it out and put all the answers on the white boards.

I've recorded down the answer for those who missed the class or missed an answer and would like to check it over:

We then received another worksheet, but this time instead of working it at home, we worked it together as a class with Mrs. Kozoriz on the SmartBoard.

The sheet that was given out:

Answers to the following worksheet:

Here, we use one of the formulas of finding velocity.

D.B. stands for Donovan Bailey and M.J. stands for Michael Johnson.

Mrs. Kozoriz also asked us how come Michael Johnson ran the 200-m faster than the 400-m. Well, because he had to do both runs! Total of 600-m and of course he would be tired and slow down !

Here, we used the same formula as we used for question one, but we rearranged it so that we could find the distance instead of the velocity.

To change the units of km/h to m/s, we have to divide the number in units of km/h with 3.6 .

** We have to make sure to change the units or else our answer will be wrong ! **

Here we also have to find the distance, but this time we use a different formula to find the distance. This formula uses both the velocity instead of one to find the distance.

Here, we now have acceleration given to us to help us find the final velocity.

Here, we use another formula to find the length of time.

It's also the same formula that we used to find the answer to the previous question, but again, we rearranged it to help find the time instead of the velocity.

What's different here, is that we have a negative acceleration.

Although it's negative, we don't do anything different, so don't let the negative sign throw you off!

For this question, it consists of 2 steps.

First we find the distance using a different formula.

Make sure you use a formula that doesn't use the final velocity to find the distance because we have to find that also.

Here, we assume that the final velocity equals to zero because it slows down to a stop.

Since the time was not given to us in the question, we have to use this formula to help us find the distance instead.

Although question 8 has four parts, we only went over how to do the first one, because once you know how to do the first one, the rest are worked out the same and should be easy to solve.

The worksheet [Gr.12 Physics Acceleration Assignment] that was given out on Wednesday, September 8th had answers given except for question 5. a) & b).

Amy had posted the worksheet and the answers but she didn't have the answers for number 5 because it was given in today's class.

So I'm just reposting the worksheet with the answers for those who might not have seen on Amy's previous post followed by the answers for question 5: