Circular Motion.

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Presentation transcript:

Circular Motion

Tangential Speed Tangential Speed is the linear speed of an object undergoing circular motion Direction of velocity: Right A D C B Direction of velocity: Up Direction of velocity: Left Direction of velocity: Down

Centripetal Acceleration and Force Centripetal acceleration and force always point toward the center of the circle

Newton’s Universal Law of Gravitation Gravity is everywhere! r is the distance between the two objects. Don’t divide it in half!

Examples of Circular Motion Force on a revolving ball (p. 117). Estimate the force that a person must exert on a string attached to a 0.150 kg ball to make the ball revolve in a horizontal circle of radius 0.600 m. The ball makes 2.00 rev/sec Find v first. V=(2πr)/T= 7.54 m/s F=mv

Calculating g To calculate g at the surface of the earth we would use the equation below and plug in the values for G, Mass of the Earth and Radius of the earth. If we want to know g at some height above the earth’s surface, add the height to the radius of the earth