In the picture above, a roller coaster car with a mass of 400 kg rolls through point A with a speed of 20 m/s. What is the force (in N) upward from the track at point A? (Hint: treat the car's motion at point A like uniform circular motion; based on its mass and speed, what force is needed to make it move in a circular path? Add the car's weight to this value.)

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Centripetal Force

A particle, body, object or certain mass while travelling in a rotational path or semicircular path, experiences an inertia force. If that inertia force pulls the towards the inward of the imaginary circle in the rotation, it is termed as centripetal force.