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

 B, Tangent to the semi-circle

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

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

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Giancoli p. 130) 2, 4