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Physics Section 7.1 Define and a pply circular motionPowerPoint Presentation

Physics Section 7.1 Define and a pply circular motion

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Physics Section 7.1 Define and a pply circular motion

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What is circular motion?

http://www.youtube.com/watch?v=-G7tjiMNVlc

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.

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)

r = radius (m)

A pilot is flying a small airplane at 56.6 m/s in a circular path with a radius of 188.5 m. The centripetal force needed to maintain the planes circular motion is 1.89 X 104 N. What is the planes mass?

If the centripetal force is removed, the object moves in a straight line in the direction of the tangential velocity.

- Assignment
- Page 239
- Problems 1-3, 5-7