In the figure, there is a schematic representation of the route followed by a roller coaster. The vehicle with mass m starts to descend with velocity v after climbing a hill of h height. Then the vehicle continues on its way through the vertical circle of radius R. a-)What is the speed of the vehicle at the top and bottom of the vertical circle? b-)What is the reaction force acting on the vehicle at the lower point of the vertical circle? c-)What is the reaction force acting on the vehicle at the top of the vertical circle? m=120kg V=3m/s h=120m R=25m

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A: ma=mgsinθ+μkmgcosθa=gsinθ+μkcosθa=9.8 m/s2sin24°+0.20cos24°=5.7766 m/s2

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.