(Car's tare mass is m 42.79) h = Place the car at the top and release it from rest. Note that the center of mass of the car is approximately at the slot where the flag is inserted. How much energy is lost? Where does it go? Place the car (without extra mass attached on it) to the starting point at the leftmost of the track and measure the height (h) of the car from the surface of the table. Calculate the final total energy of the car. The Law of Conservation of Energy is stated as E constant +įigure 1 Step Configuration 1. If the friction is ignored, the total energy of the car does not change. g is the acceleration due to gravity and h is the height of the car above the position, where the potential energy is defined to be zero. Also, if the car is released from the top of the hill so it casily makes it over the top of the loop, the speed of the car can be measured at the top of the loop and the centripetal acceleration as well as the apparent weight (normal force) on the car can be calculated Theory The total energy (E) of the car is equal to its kinetic energy (K = V) and its potential energy (U= mgh), where m is the mass of the car and v is the speed of the car. Then the prediction can be tested on the real roller coaster. The height from which the car must be released from rest to just make it over the loop can be predicted from conservation of energy and the centripetal acceleration. The total energy is calculated for two points on the track and compared. The potential energy is calculated from the measured height and the kinetic energy is calculated from the speed. 1 PASCO contre Equipment: Roller Coaster Complete System Photogate Heads Smart Timer Introduction A car is started from rest on a variety of shapes of tracks and the speeds of the car at various points along the track are measured using a photogate connected to a Smart Timer.
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