Circular Motion

1. Find a stone with a hole in it...

2 Tie one end of a 1.5 metre length of string to store.

3 Hold other end of string and whirl the stone around your head.

Right, now the answers.

1 Circular motion is what the stone is doing.

2 centripedal force is the force your hand is supplying to keep pulling the stone in towards the centre of rotation .

3 Centrifugal force is the equal and opposite force to No 2 which is pulling the stone outwards as it tries to continue in a straight path rather than a circular one.

Now let go of the string and watch the stone continue on it's straight path...See how it smashes the monitor? Now run the other way.

I suggest the water in the bucket method. Swing the bucket full of water round and round in a vertical plane and notice that centrifugal force is what is keeping the water in the bucket. Slowly decrease the speed of rotation until the force of gravity equals the centrifugal force on the water and notice that centrepital force (the force that's jerking you around as you whirl the bucket) decreases. Decrease the speed of rotation further and notice that you're getting wet.

This is a priceless example, that would fit some of the CR4 member responses in a previous thread -- Why does CR4 allow Guests to post anonymously?

I would give myself OFF TOPIC votes, BUT I don't know what the topic is.

Yeh..presumably the procedure to launch satellite is..

Press big button marked 'satellite launch' ?

Yes --- and I think circles still have something to do with several degrees of arc (360 I think ) around a common center --- not sure though, -- is that still true???

Sooo, let's see, circular motion -- oh yeah I get it now!!! is that the topic???

You for got.

10, 9, 8, 7, 6, 5, 4, 3, 2, 1,