A pendulum is in vertical position when put it in a stopped car. What will happen when the car start to accelerate with acceleration a? The car will swing with new equilibrium position. The following applet will show you the case: You can change the acceleration a and the drag coefficient (assume drag force propotional to velocity put in the oppositive direction)

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Enjoy the fun of Physics! You can access this simulation online from
Pendulum in an accelerated car
Designed by Fu-Kwun Hwang (http://www.phy.ntnu.edu.tw/ntnujava/)
Deptartment of Physics, National Taiwan Normal University, Taiwan