PSC 1121 Lecture Notes - Lecture 7: Centripetal Force

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redprairie-dog375

1 Mar 2018

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Document Summary

Physical science: rotational motion, centripetal force, artificial gravity (l10) Circular motion: an object is moving on a circle with constant speed. It does not affect the magnitude of the velocity but only the direction of motion. In general, the object may have another component of acceleration along the direction of motion affecting its speed as well: the centripetal acceleration is caused by centripetal force, turning changes the velocity vector. The force that turns things , without changing their speeds is called centripetal force: fc= m v^2/r. A radius r can be drawn to match a curve at any point along the curve. Then the force on the moving object is fc = m v^2 / r. Racetracks are at an angle so that when the car turns it is easier on the tires when making the turn. If there is not enough centripetal force, you cannot go around a curve.

Related Questions

Introduction

This experiment involves centripetal force, the force that keeps objects moving in a circular path. This force is perpendicular to the motion and directed towards the centre of the circular orbit. By Newton's Second law when a centripetal force acts on a mass (in the horizontal plane), the force continually changes the direction of the velocity accounts for the centripetal acceleration of the mass, whose direction is towards the centre. The relationship between the centripetal force, the mass of the orbiting object, and its speed and distance from the centre are described by:

Extension Question:

When twirling the mass, students found that despite their best efforts, they could not swing the ball so that the cord remained exactly horizontal.

On the diagram of the rotating mass below, draw a force diagram of the force acting on the mass and identify each force. Don't include any force component in this diagram.