This experiment is made for describing the fourth force that is important in engineering,called friction.The rail is placed on a downward position so we can check the friction between of it and the car.This can be calculated if we compare the weight force and the normal resistance that acts between the rail and the car.As a result we can see that the car has reduced speed because of the friction force which acts against the car movement.
Marios Panayiotou
Konstantinos Dimitriou
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