Introductory Centripetal Force Problem - Car over a Hill

A 453 g toy car moving at 1.05 m/s is going over a semi-circular hill with a radius of 1.8 m. When the car is at the top of the hill, what is the magnitude of the force from the ground on the car? Want Lecture Notes? http://www.flippingphysics.com/centri...
This is an AP Physics 1 topic.

0:00 Intro
0:08 Translating the problem
1:49 Drawing the free body diagram
2:43 We need to sum the forces in the in-direction
3:22 The “in-direction” is positive. The “out-direction” is negative
4:06 Identifying the centripetal force in this problem
4:54 Solving the problem … finally.
6:15 Kit compares the magnitudes of the force normal and force of gravity

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