Physics Section 7.1 Define and a pply circular motion

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# Physics Section 7.1 Define and a pply circular motion - PowerPoint PPT Presentation

Physics Section 7.1 Define and a pply circular motion. What is circular motion? http://www.youtube.com/watch?v=-G7tjiMNVlc. Any object that revolves about a single point or axis undergoes circular motion.

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Physics Section 7.1Define and apply circular motion

What is circular motion?

Any object that revolves about a single point or axis undergoes circular motion.

Tangential speed (vt ) is the speed of an object in circular motion. If the tangential speed is constant the motion is uniform circular motion.

Centripetal acceleration causes an object to change its direction. It is directed toward the center of the circular path.

ac = (vt)2 ac = centripetal acceleration (m/s2)

r vt = tangential speed (m/s)

r= radius of the circular path (m)

A rope attaches a tire to a tree limb. A girl swinging on the tire has a centripetal acceleration of 3.0 m/s2. If the length of the rope is 2.1 m, what is the girl’s tangential speed?

Tangential acceleration causes a change in the tangential speed of an object in circular motion.

Centripetal Force is a force directed toward the center of object in circular motion. It causes centripetal acceleration.

Fc = m(vt)2Fc = centripetal force (N)

r vt = tangential speed (m/s)