"Not everything that counts can be counted, and not everything that can be counted, counts."
- Einstein
I. Uniform Circular Motion
What does this picture tell you about the
speed of these motorcyclists?
Nina Prinz and Letizia Marchetti - Ducati Women's Motorcycle Racing Team
A large centripetal (center directed) force is needed when your speed is large.
|
Centripetal
Force Rutgers U. |
Circular Motion Rutgers U. |
St. Mary's H.S. Physics
Skater
Rutgers U.
In order for an object to move at constant speed in a circle, an outside force must constantly turn the object toward the center of circular path. |
by Dr. Michael R. Gallis - mrg3@psu.edu Penn State Schuylkill
 |
 |
|
 |
 |
 |
||
 |
||
|
||
 |
 |
|
 |
 |
Where should you release the ball
to hit the target?
| Larger |
B
At point P, the car hits an area of ice and loses all frictional force on its tires. Which path does the car follow on the ice?
June 2001 Regents
A. Equations & Vectors
1. Centripetal Acceleration (ac) - acceleration toward center of curvature
| a) Equation: | ac = | V2 |
| r |
b) (V) Instantaneous Velocity - tangent to circle, in the direction of the motion
c) Centripetal Force (Fc) - force directed toward the center of the circle
Ex) A car moving in a circular path with a radius of 2.0 m has a velocity of 8.0 m/s. What is the centripetal acceleration of this car?
Ex) A car moving in a circular path with a radius of 2.0 m has a velocity of 8.0 m/s. What is the centripetal acceleration of this car?
| ac = | V2 |
| r |
| ac = | (8.0 m/s)2 |
|
2.0 m |
ac = 64/2
ac = 32. m/s2
