# phyiscs mechanics

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Thread starter 1 month ago
#1
https://pmt.physicsandmathstutor.com...n%202%20QP.pdf

mark scheme :
https://pmt.physicsandmathstutor.com...n%202%20MS.pdf

Im a bit confused with 2 c. I dont understand the last marking point. How is the resultant force less, and where does Wsin(theta) come from. Can someone help me please
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1 month ago
#2
(Original post by fiftythree)
https://pmt.physicsandmathstutor.com...n%202%20QP.pdf

mark scheme :
https://pmt.physicsandmathstutor.com...n%202%20MS.pdf

Im a bit confused with 2 c. I dont understand the last marking point. How is the resultant force less, and where does Wsin(theta) come from. Can someone help me please
W sin theta is the component of weight of car acting down the slope its written in ms
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1 month ago
#3
(Original post by fiftythree)
https://pmt.physicsandmathstutor.com...n%202%20QP.pdf

mark scheme :
https://pmt.physicsandmathstutor.com...n%202%20MS.pdf

Im a bit confused with 2 c. I dont understand the last marking point. How is the resultant force less, and where does Wsin(theta) come from. Can someone help me please
the resultant force acting on car in part 2a is 3600N which is The braking force so there is only 1 force acting on car.
in part 2c when car is going down the slope , it now has 2 forces acting on it. The same 3600N Frictional force and the the weight of car down slope(which you can regard as forward force). Resultant is (forward force - frictional force), so even if we dont know the value of w sin theta we can see that its going to be less than the resultant force in part 2a.
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