top-rated free essay

Centrifugal Force

By tanmaychopra007 May 06, 2013 543 Words
| Introduction to| Circular Motion|
| Physics| |
|
HomeNewton's LawsMomentum & ImpulseProjectile Motion & Mechanical EnergyCircular MotionLinks & Extras| IntroductionIn uniform circular motion the magnitude of the velocity of the object in motion remains constant. For example at car turning around a circular curve will stay at 12 m/s throughout the entire turn (provided the driver does not brake). The direction of the velocity vector is changing. A force is required in uniform circular motion.Centripetal Force & AccelerationSince an object in motion will travel in a straight line (Newton's First Law) an force must be required to accelerate the mass . This force does not cause a change in velocity as stated in the introduction, but rather it is responsible for the change in direction. The centripetal acceleration (ac) is equal to the square of the velocity (v) over the radius of the circular motion. According to Newton's Second Law, then the centripetal force (Fc) should be the mass of the object (m) times the centripetal acceleration. The equations are pictured above.Important Facts * "Centrifugal" force is a fictitious force. It is a perceived force. There is no reactive force as per Newton's Third Law. This the 'force' that you feel when you take a turn in a car or on a roller coaster. If this was a real force, then when your car slips on ice or the roller coaster your on breaks, you should fly outward perpendicular to the direction of your motion. Obviously this is not true. * If the centripetal force is removed, the object will continue on a path tangent to the circle. In other words, you should continue in a straight line in the same direction at the motion at the exact instant the centripetal force is removed. * The centripetal force vector always points to the center of the circlar motion. * The centripetal could be the tension in a string, gravity (for simple planetary orbit like in simulation), friction (i.e. the car on pavement), or other force. This equivalency is very helpful for our calculations. See table below: Force| Equation| Info| Tension| | Like a string or other physical connection. i.e. Swinging keys on a lanyard. The keys are the mass and the Fc is equal to the tension in the lanyard.| Gravity| | Gravity keeps items planets and moons in orbit (a simple form of uniform circ. motion). There is not physical connection. See Newton's Law of Universal Graivitation| Friction| | Friction is the only thing keeping cars from spinning out at every turn. In icy conditions there is little friction and so you have to keep your speed low or else you will spin out of your turns.| An Example

Why does the roller coaster stay up?The roller coaster stays up because the centripetal force is greater than or equal to the weight of the car and the people. Both the weight and Fc vectors are pointed downward at the top. However the reaction force or normal force (Fn) is upward and equal to Fc. The inertia (urge for to travel in a straight line) of the car pushes it up (Fn) against the track with a force equal to Fc. So: Fnet = mg - Fn. The people may feel a feeling weightlessness if Fnet is 0.|

Cite This Document

Related Documents

  • Centrifugal Force Report

    ...Mechanics Practical Number 2  Centrifugal Force Apparatus HFC21  Objective:   The object of the experiment is to verify that the centrifugal force varies in direct proportion to 1. The mass of the rotating body M (Experiment parts 1 and 2) 2. The square of the speed of rotation ω (Experiment part 3) 3. The radius of gyration k...

    Read More
  • Centrifugal Pump

    ...CENTRIFUGAL PUMPS Introduction A centrifugal pump is a rotodynamic pump that uses a rotating impeller to create flow by the addition of energy to a fluid. Centrifugal pumps are commonly used to move liquids through piping. The fluid enters the pump impeller along or near to the rotating axis and is accelerated by the i...

    Read More
  • Force and Acceleration

    ...Chapter 4 Newton’s Laws Conceptual Problems 1 • While on a very smooth level transcontinental plane flight, your coffee cup sits motionless on your tray. Are there forces acting on the cup? If so, how do they differ from the forces that would be acting on the cup if it sat on your kitchen table at home? Determine the Concept Yes, there are...

    Read More
  • Physics Notes (Forces)

    ...Physics notes Force is an agent which produces or tends to produce motion in an object, stops or tends to stop , motion of an object Newton's 1st law of motion: If an object is at rest, will remain at rest until or unless an external force act on it. If an object is in motion , it continues its motion until or unless an external force act...

    Read More
  • Physics Test Notes on Forces

    ...* Constant speed = no acceleration = sum of all net forces is zero * An object in orbit around the earth is not truly weightless * Sitting half as far away from your class mate the gravitation force is four times as strong. (re2) * Newton’s First Law- inertia an object that is not moving will remain at rest (ex: and apple hanging...

    Read More
  • Force vs Area

    ...Force vs. Area Connor Blackmon Chemistry I H, 1st Period Mrs. Kris Clements October 18, 2012 Problem Will a balloon pop if it is places on a bed of nails and pressure is applied? Hypothesis If a balloon is placed on a bed of nails and a force is applied, then the balloon will burst. Variables Independent variable- For...

    Read More
  • Al Physics Centripetal Force

    ...AL Physics Centripetal Force(1ST Lab Report) Objective : To measure the centripetal force by whirling it around a horizontal circle, then compare the result with theoretical value FC = m(2r. Apparatus : 1Rubber bung 1Glass tube (About 15 cm long) 1Slotted weights, with hanger 12 × 0.02 kg 1Nylon thread 1.5 m 1Paper marker 1Adhesive...

    Read More
  • Definition of Force

    ...Definition of Force   A force is a push or pull upon an object resulting from the object's interaction with another object. Whenever there is an interaction between two objects, there is a force upon each of the objects. When the interaction ceases, the two objects no longer experience the force. Forces onlyexist as a result of an inte...

    Read More

Discover the Best Free Essays on StudyMode

Conquer writer's block once and for all.

High Quality Essays

Our library contains thousands of carefully selected free research papers and essays.

Popular Topics

No matter the topic you're researching, chances are we have it covered.