Review - Velocity, Circular Motion

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A. Equations & Vectors

 

 

Review

Why is an object moving at constant speed
in a circle considered to be accelerating?

 

 

 

 

Because while its speed is not changing,
its direction is.

 

1. Centripetal Acceleration (ac) - acceleration toward center of curvature

 

 a)Equation: ac = V2
r

 

 

 

r - radius,
V - velocity

 

 

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

 

 

 

 

 

 


 

Circular Velocity Game (Flash)

[ HTML5 ] Game

 

 

 

 

Giancoli p. 130) 2, 4

 

 

 

 

 

 

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