Foundation(VCE) Physics Questions :S

[TrueTears]

Let up be +ve and down be -ve

now let's analysis all the forces on the car

we got N going up, mg going down and going down. (if the net force was going up, then the car would not be on the ground! lol)

so



solving for N yields N = 5800N

[bucket]

Ah i see...but why does the sum of the forces equal the centripetal force? lol
Nevermind... so simple... because the centripetal force is the net force
duh.
sorry lol

[TrueTears]

Ah i see...but why does the sum of the forces equal the centripetal force? lol
Nevermind... so simple... because the centripetal force is the net force
duh.
sorry lol

yeap, the sum of all the REAL forces = Net force

[bucket]

Another...lol

"A 1200kg car rounds a curve of radius 70m banked at an angle of 12^o. If the car is traveling at 90km/h, will a friction force be required? If so how much and in what direction?"

[TrueTears]

Now draw a diagram and split everything into its parallel and perpendicular components, this yields:





N = 12022.73

so



solving for yields 8398.14N

direction: towards centre of the curve

EDIT: sorry forgot to square the -_-""

[bucket]

Thanks heaps man.