BHS -> Staff -> Mr. Stanbrough -> Physics -> Mechanics -> Newton's Laws -> Newton's First Law -> this page
Demonstrate the "objects in motion" part of Newton's First Law
Bucket with handle and water
Show that the water doesn't fall out of the bucket when the bucket is whirled in a vertical circle.
Why doesn't the water fall out when the bucket is upside down? The water is moving horizontally at the top of the circle, so it "wants to" continue to move horizontally (Newton's First Law) - it has no tendency to fall in this situation!
Not "centrifugal force"!