Qualification > Queries
Maths & Physics Help
astarmathsandphysics:
The car can be moving forward but slowing down which is accelerating backwards. The driving for can be forwards, and friction is always against the direction of motion.
Pharoah:
But isn't friction always forward in tyres? Ok I think I get it. If the driving force is forwards, both forces will be added to give acceleration. Am I right?
astarmathsandphysics:
If both forces are backwards, it probably means the brakes are applied. Then the forces are added.
I the engine is moving the car forward and thwe car is slowing down then the friction force is bigger than the engines force.
nox_fjmoony:
Hey, I was practising add maths from the qp and well I kinda got stuck. Its no 11 OR from the o/n-07 paper 1 add maths qp. Its the CIE one. Thanks in advance. :D
astarmathsandphysics:
--- Quote from: nox_fjmoony on June 21, 2009, 07:32:31 am ---Hey, I was practising add maths from the qp and well I kinda got stuck. Its no 11 OR from the o/n-07 paper 1 add maths qp. Its the CIE one. Thanks in advance. :D
--- End quote ---
i)
ii)Stationary point is where
so so then
iii)rearrange to make the subject
Then integrate to get
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