Why does mud fly off a rapidly turning wheel? The centripetal force that holds the mud to the wheel is lost, so the mud flies off with a tangential speed. The force that causes the change in direction.

- Q. Can you have a zero tangential and nonzero centripetal acceleration?
- Q. Can a car have a centripetal acceleration but no tangential acceleration?
- Q. Is it possible to drive in a circle and not accelerate?
- Q. Can a car move around a circular racetrack?
- Q. Why is a car accelerating as it travels in circles?
- Q. Which of the following is constant for an object in uniform circular motion?

## Q. Can you have a zero tangential and nonzero centripetal acceleration?

If our object is increasing its speed or slowing down, there is also a non-zero tangential acceleration in the direction of motion. But when the object is moving at a constant speed in a circle then only the centripetal acceleration is non-zero.

## Q. Can a car have a centripetal acceleration but no tangential acceleration?

Driving in a circle at a constant speed requires a centripetal acceleration but no tangential acceleration.

## Q. Is it possible to drive in a circle and not accelerate?

The velocity vector is constant in magnitude but changing in direction. For this reason, it can be safely concluded that an object moving in a circle at constant speed is indeed accelerating. It is accelerating because the direction of the velocity vector is changing.

## Q. Can a car move around a circular racetrack?

No, because moving in a circular track implies a changing in the direction of motion, which leads to the existence of the centripetal acceleration.

## Q. Why is a car accelerating as it travels in circles?

For example, a car travelling on a roundabout will move at a constant speed, but with a changing velocity, as its direction is constantly changing. The centripetal force that acts inwards is due to the friction between the car’s tyres and the road. This force keeps the car moving in a circular path.

## Q. Which of the following is constant for an object in uniform circular motion?

Uniform circular motion is an object traveling in a circular path with a constant speed. Thus the angular velocity is constant in uniform circular motion. The centripetal acceleration is always changing, as the acceleration vector always points towards the center of the circular path.

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