Free body diagram for circular motion help please!?

Please help and show how to find each! Thank you!

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1 Answer

  • NCS
    Lv 7
    1 month ago

    I crammed as much as I could into your image.

    Each of the forces in red "break down" into vertical and horizontal components (see the Example at #3). Assuming vertical equilibrium, the vertical component is equal to the weight, m*g. The horizontal component provides the centripetal force.

    #5 is an odd case. If the velocity is large enough, the vertical component of the centripetal force will exceed the weight and the car will lose contact with the road. The centripetal force is actually in the direction of N. At the threshold, N disappears and the car is just barely touching the road.

    Notice that the centripetal force isn't explicit in any of the images. That force is provided by something that IS explicit -- tension, lift, a normal force. That's why I had a hard time drawing for #5. "N" varies with the speed of the car.

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