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Without the force of the string, the car moves in a straight line. If something moves in a circle, there must be a force that keeps it moving in a circle.
- a) What force kept the toy car moving in a circle?
- b) In which direction must this force point?
3. There is no string that keeps a real car moving around a curve. However, if the car is to move around the curve, there must be a force pointing toward the center of the curve. Imagine the road surface covered with slick ice. The car would not "make the curve" but would keep moving in a straight line and go off the road. It wouldn't matter which way you pointed the wheels— no turning.
- a) What is the force that keeps a real car moving around a curve?
4. In a roller coaster, there are horizontal curves similar to those on the road.
- a) Sketch the coaster moving around such a curve.
- b) Draw an arrow showing the velocity of the car. This is the direction it would go if there were no force.
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