PHYS 1010Q Lecture 9: Circular Motion, Newton’s Gravity
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Example: both for the simple layer and the car jack the device can multiply the force, but note that the input distance is much larger than the output distance. Thus the work we put into the machine equals the work we get out of it. The block and tackle also multiplies force at the expense of distance. We can not create energy, only transform it from to another. We are most interested in those cases were the speed of the object stays constant as it moves in a circular path. The direction of the acceleration a= v/ t points toward the center of the circle and is called the centripetal acceleration. Since newton"s 2nd law tells us that f=ma, then there must be a real force which points in the centripetal (inward) direction that is responsible for this centripetal acceleration. Circular motion can not persist without this inward force.
