Circular Motion

1
Circular Motion
2
Tangential Speed

• Tangential Speed is the linear speed of an object
  undergoing circular motion

3
Centripetal Acceleration and Force

• Centripetal acceleration and force always point
  toward the center of the circle

4
Newtons Universal Law of Gravitation

• Gravity is everywhere!
• r is the distance between
• the two objects. Dont
• divide it in half!

5
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(2pr)/T 7.54 m/s
• Fmv

6
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
  earths surface, add the height to the radius of
  the earth