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The Boat on the Ice

I took this picture in bingshidajie, Harbin. I tried to take the shot of circumferential motion of car. According to physics LibreTexts, Circular Motion is a movement of an object alon the circumference of a circle or rotation along a circular arc. It can be uniform, with a constant rate of rotaion and constant tangetial speed. In this photo, you can see a car which is connected with rubber boat. The car keep pulling this rubber boat, so the rubber boat draws circle. In the rubber boat case, the direction of acceleration is pointed to the car, since the boat is connected with the rope to the car.