Predictions for this year's Unit 3 Exam

[DisaFear]

In electronics, what is an analogue system?

[b^3]

In analogue system the signal can take a continuous range of values, unlike a digital system that takes only a set range of values.

[thatisanote]

So can anyone confirm for me:
Banked curve
Fn=Fg/(cos(theta)) ? Or does Fn=Fg*cos(theta)
netF=mgtan(theta)?
netF=Ffriction*cos(theta)+N*sin(theta)
mv^2/r=mgtan(theta) + Ffriction*cos(theta)

I'm sure one of those is wrong...

[adelaide.emily10]

So can anyone confirm for me:
Banked curve
Fn=Fg/(cos(theta)) ? Or does Fn=Fg*cos(theta)
netF=mgtan(theta)?
netF=Ffriction*cos(theta)+N*sin(theta)
mv^2/r=mgtan(theta) + Ffriction*cos(theta)

I'm sure one of those is wrong...

i think that is all right except:
Normal force=mg/cos(theta) not mg*cos(theta)

[ttn]

So can anyone confirm for me:
Banked curve

mv^2/r=mgtan(theta) + Ffriction*cos(theta)

Yeah, that's what my tutor got as well.

[cranberry]

is that for friction acting up or down the slope? or does it not matter?

[Bozo]

Ok, i need a diagram of like one of those questions they'd ask you about a car. And the forces acting through it. Stationary and moving, because i know that something happens with the friction?

[Asx4Life]

Is question 9 of insight 2011 wrong? How did they get the clipping at 1v and 7v? Isn't it supposed to be clipping at 1v and 7v instead???

[johnbob12]

So can anyone confirm for me:
Banked curve

mv^2/r=mgtan(theta) + Ffriction*cos(theta)

Yeah, that's what my tutor got as well.

Shouldn't it be mv^2/r=mgtan(theta)+Ff/cos(theta)

mv^2/r=Nsin(theta)+Ffcos(theta)
Ncos(theta)=mg+Ffsin(theta)
Then solve for N in equation 2 and sub it into equation 1.

[adelaide.emily10]

i clipped it at 1v and 9v - my teacher said the answer for that question is wrong

[Asx4Life]

i clipped it at 1v and 9v - my teacher said the answer for that question is wrong

Yeah, I meant 1v and 9v. Also  question 7 of structures and materials is wrong right? I friggin followed their calculations, yet I got 2,250,000 instead of their answer of 500,000,000. this is pissing me off

[adelaide.emily10]

i clipped it at 1v and 9v - my teacher said the answer for that question is wrong

Yeah, I meant 1v and 9v. Also  question 7 of structures and materials is wrong right? I friggin followed their calculations, yet I got 2,250,000 instead of their answer of 500,000,000. this is pissing me off

yep q7 is wrong - the correct answer is 2.5 x 10^6 or something along those lines

[jinny1]

How did you guys derive:

Fc=mgtan(theta)
 
??

[xZero]

banked curves, vertical net force = 0 since the object is moving in a horizontal circle. So Ncos(theta)=mg, since centripetal force is Nsin(theta), Fc=Nsin(theta), Fc=mg*sin(theta)/cos(theta). Fc=mgtan(theta)