Predictions for this year's Unit 3 Exam

[dopplereffect]

I was speaking to one of the physics teachers at my school and she said that there will a lot more definitions than calculations relative to past years so that girls will be more better off than previously, no joke.

[jinny1]

How wud ur teacher know???

[soopertaco]

I was speaking to one of the physics teachers at my school and she said that there will a lot more definitions than calculations relative to past years so that girls will be more better off than previously, no joke.

statement of fact or speculation?

[xZero]

Bank curves involving friction to throw people off and stop people from using a pre-rearranged forumla. Couple of force diagrams and some tricky question asking you to find tension between two objects like question 1 or 2 from 2010 exam. Electronics they might have a question with short circuit and special relativity should be easier given last year was pretty hard.

[thushan]

Thoughts on predicted difficulty of this year's exam, measured by A+ cutoff out of 90? I'm going for something <80, so say 78?

[ttn]

Bank curves involving friction to throw people off to stop people from using a pre-rearranged forumla.

How would you go about solving something like that?

My teacher gave us a formula but not sure if it actually works or not.

Fnet = Frcos(theta) + Nsin(theta)

[xZero]

What is this... they have a formula for everything Assuming Fr = Friction then yeah that formula works pefectly although I suggest drawing a free body diagram to fully understand the situation.

[ttn]

Oh, but I'm a bit confused about the N bit, teacher says it's just the weight?

[xZero]

N is the normal force, on a banked curves N =/= weight force

[ttn]

So it's going to be

Fnet = Frcos(theta) + mgcos(theta)sin(theta)??
     

[cranberry]

^^ stop, ur confusing me lol

[ttn]

So I just scanned the diagram from the Jacaranda text book.

Looks like the actual 'N' is mgcos(theta)?

[yawho]

explain the advantage of banking a curved road

[cohen]

From my help sheet; Banking the road eliminates the need for a sideways frictional force and allows the car to travel faster without skidding out of the circular path,

[yawho]

you stated the advantage, but how do you explain it?