Physics circular motion
- 8. WHAT IS CIRCULAR MOTION ? In physics, circular motion is a movement of an object along the circumference of a circle or rotation along a circular path. It can be uniform, with constant angular rate of rotation (and constant speed), or non-uniform with a changing rate of rotation. The rotation around a fixed axis of a three-dimensional body involves circular motion of its parts. The equations of motion describe the movement of the center of mass of a body. Examples of circular motion include: an artificial satellite orbiting the Earth at constant height. A stone which is tied to a rope and is being swung in circles, a car turning through a curve in a race track.
- 9. An electron moving perpendicular to a uniform magnetic field, and a gear turning inside a mechanism.
- 10. TYPES OF CIRCULAR MOTION There are two types of circular motion :- Uniform circular motion :-Uniform circular motion can be described as the motion of an object in a circle at a constant speed. As an object moves in a circle, it is constantly changing its direction. At all instances, the object is moving tangent to the circle. Since the direction of the velocity vector is the same as the direction of the object's motion, the velocity vector is directed tangent to the circle as well. The animation in the next depicts this by means of a vector arrow.
- 15. Your speedometer tells you the magnitude of your car's velocity vector, so when you go around a curve while keeping your speedometer needle steady, you are executing uniform circular motion. If your speedometer reading is changing as you turn, your circular motion is non-uniform. Uniform circular motion is simpler to analyze mathematically, so we will attack it first and then pass to the non-uniform case.
- 16. VOCABULARY • uniform circular motion — circular motion in which the magnitude of the velocity vector remains constant • Non-uniform circular motion — circular motion in which the magnitude of the velocity vector changes
- 17. Summary • If an object is to have circular motion, a force must be exerted on it toward the center of the circle. There is no outward force on the object; the illusion of an outward force comes from our experiences in which our point of view was rotating,
- 18. A PRESENTATION BY -VASUDHA ARORA -IX-B -38