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How do vehicles turn so smoothly? When a car makes a U-turn, the outer wheel travels farther than does the inner wheel. So why doesn’t the car feel jerky?

In this lesson, students calculate the circumferences of circles to determine how far vehicles travel during a turn and explore the engineering that allows cars to turn so smoothly.

- A turning radius describes the smallest circle a car can make. The smaller the radius, the tighter the turn.
- Left and right car wheels have to cover different distances – and thus rotate different numbers of times – when turning. A differential axle allows this to happen.

- Calculate the circumference of a circle
- Model with geometry to solve real-world problems