The most important applications of circular motion | POINT classical mechanics
The most important applications of circular motion
1: Design of road curves
1- Centripetal force must be calculated when designing road and railway curves to move Cars and trains on a curved path without skidding.2- If a car moves on a viscous curved road, the frictional forces may not be sufficient to turn the car in the curved path, so the car slips and the tires crawl on the side road. It continues on the curved path.
3- Heavy vehicles are prohibited from moving on some dangerous curves because the greater the mass of the vehicle, the greater the centripetal force required (F ∝ m).
4- Road engineers specify a certain speed for movement on curves that should not be exceeded because the faster the car is, the greater the centripetal force it needs to move on the curved path where (F ∝ v²).
5- You should drive at a low speed on dangerous curves to avoid their danger because the smaller the curve radius, the greater the centripetal force the car needs to turn in it without slipping where (F ∝ 1/r).
2: When a bucket filled halfway with water is moved in a vertical circular motion at a sufficient speed, the water does not spill out of the bucket, because the centripetal force acting on it is perpendicular to the direction of motion, changing the direction of the speed without changing its magnitude. The water rotates in a circular path and remains inside the bucket.
3: The phenomenon of the movement of objects away from the circular path is used when the centripetal force is not enough for circular motion in:
1- Cotton candy making machine.
2- Spinning barrel game in the amusement park
3- Drying clothes in automatic washing machines: Water molecules adhere to the clothes with a certain force. When the dryer spins at a high speed, the force is not sufficient to keep the molecules in its orbit, so they are launched towards the tangent to the circumference of the rotating circle and separate from the clothes.
*When using an electric whetstone, it starts the glowing metal fragments in straight lines are the directions of the tangential velocities of the stone's rotation.