Forces

What are they and what do they do?
Centripetal and centrifugal forces

Centripetal force
When a roller coaster is moving through the loop on the track this force comes into play.
This is the force that causes an object to move in a circle.

What is it?
A force which pulls an object toward the centre of a circle is called a centripetal force.
Centripetal force, is what makes an object move in a circular path.
When you swing a stone around on a string, you must pull on the string to keep the stone from flying off in a straight line. The pull the string applied to the object is centripetal force.

Take as an example a stock car,
when it turns a corner the force that holds it on the track is the inward pull called centripetal force

Centrifugal force
This is the force that is often used to describe why mud gets spun off a spinning tire, or water gets pushed out of the clothes during the spin dry cycle of your washing machine.

What is it?
An object travelling in a circle behaves as if it is experiencing an outward force.
If the object is heavier, the force will be greater
If the object is faster, the force will be greater
And if the distance from the centre is greater the force will be greater too.

We are all familiar with the effects of centrifugal force
we experience it every time we are in a car and take a bend - we feel a force pushing us to the outside of the curve.
And if you have placed a cassette tape on the seat next to you when taking a sharp bend at speed, it slides across the seat.

Centripetal force
Centrifugal force
This force is an inward pull
This force holds an object in a circle
This force is an outward pull.
This force pushes an object away from the circle
What’s the difference ?

Credits
Made by
Christina
And
Jessica
Music: One step Beyond

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Forces

by missfeasey on Oct 28, 2009

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Forces — Presentation Transcript