The resultant force perpendicular to the velocity, and therefore directed towards the centre of the circle, required to keep a body in uniform circular motion
Centripetal force is always perpendicular to the linear velocity (i.e., the direction of travel)
Examples of centripetal force
A bucket of mass 8.0 kg is filled with water is attached to a string of length 0.5 m.What is the minimum speed the bucket must have at the top of the circle so no water spills out?
Step 1: Draw the forces on the bucket at the top
Step 2: Calculate the centripetal force
Step 3: Rearrange for velocity v
Step 4: Substitute in values
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