| Lateral Force
Below is a free-body diagram of the maximum vertical and lateral forces the vehicle will experience due to a 20% incline and the weight of the car with a 150 lb driver.
The numbers in the free-body diagram come from summing the forces and moments in the lateral and vertical directions. The 600 lb load comes from the combined weight of the car and driver. The highest lateral force the car can experience before sliding or tipping is 480 lb. For a worst-case scenario, each lateral force must be less than or equal to the product of the coefficient of friction and its corresponding vertical force. The calculations can be seen below.
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