A car of mass 1000kg travels over a humpback bridge of radius of curvature 50m at a constant speed of 15m/s. calculate the magnitude and direction of the force exerted by the car on the road when it is at the top of the bridge. assume g=10ms-1
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shaziakhan004:
I checked at the back, The answer is supposed to be 5500N. I think we missed a step.
I got 4500 too but the book says it’s 5500N
wait
have a look
srry for silly mistake
How is Fc opposite mg? Isn’t Fc supposed to be towards the centre of the circle?
Oh i got it. Never mind. Thanks :)
centrifugal forces always act away from centre.
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Explanation: This is the method to do it. The method of AmritRaaj is wrong because centrifugal force doesn't exist. It is a wrong concept.
The weight, W = mg, is greater at than the normal force at the top of the bridge. This is due to the velocity. It is a point where you feel a bit of weightlessness.
You'll find this answer on Khan Academy under the title of Centripetal force problem solving
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