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Q: How is it possible for a stuntman to pull a bus with his teeth?

A: According to https://www.howstuffworks.com, the main force that has to be overcome is the rolling resistance of the bus tires, which depends on the weight of the vehicle and the coefficient of rolling resistance of the tires. The big tires on a bus, for instance, have a coefficient of 0.006 to 0.01. If the bus weighs 50,000 pounds and the coefficient is 0.006, the amount of force required to move it is the product of the two numbers, or 300 pounds. That can easily be generated by a man’s legs. The other consideration is the coefficient of friction of the puller’s shoes. That is generally less than 1, so the puller must apply greater force. Alternatively, many stuntmen will place a ladder on the ground to have something to push against. For more information, try: https://www.howstuffworks.com/question523.htm