3 2 Centripetal Acceleration Centripetal Acceleration Uniform circular

Centripetal Acceleration • Uniform circular motion: The motion of an object with a constant

Centripetal Acceleration • For an object undergoing uniform circular motion – speed is constant

Centripetal Acceleration • For a circular path, the distance travelled is the circumference of

Centripetal Acceleration • Given that, • The formula for Centripetal acceleration becomes:

Centripetal Acceleration • Frequency (f) is equal the number of revolutions per unit of

Example A child rides a carousel with a radius of 5. 1 m that

Example A salad spinner with a radius of 9. 7 cm rotates clockwise with

Example The centripetal acceleration at the end of an electric fan blade has a

Homework Read Section 3. 2 Questions p. 118 #1 -6

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3. 2 Centripetal Acceleration

Centripetal Acceleration • Uniform circular motion: The motion of an object with a constant speed along a circular path of constant radius • Centripetal acceleration (ac): The instantaneous acceleration that is directed toward the centre of a circular path

Centripetal Acceleration • For an object undergoing uniform circular motion – speed is constant – direction is constantly changing • If the velocity changes, then the object is accelerating. • The magnitude of the centripetal acceleration is constant, but the direction changes every instant so that it is always directed to the centre of the circle.

Centripetal Acceleration • For a circular path, the distance travelled is the circumference of the circle which is completed in one period (T), the time it takes to complete one revolution. Where: v is the velocity r is the radius T is the period

Centripetal Acceleration • Given that, • The formula for Centripetal acceleration becomes:

Centripetal Acceleration • Frequency (f) is equal the number of revolutions per unit of time (1/T) we can also describe centripetal acceleration as: Where ac is the centripetal acceleration r is the radius f is the frequency in Hz

Example A child rides a carousel with a radius of 5. 1 m that rotates with a constant speed of 2. 2 m/s. Calculate the magnitude of the centripetal acceleration of the child.

Example A salad spinner with a radius of 9. 7 cm rotates clockwise with a frequency of 12 Hz. At a given instant, the lettuce in the spinner moves in the westward direction. Determine the magnitude and direction of the centripetal acceleration of the piece of lettuce in the salad spinner at the moment shown.

Example The centripetal acceleration at the end of an electric fan blade has a magnitude of 1. 75 x 103 m/s 2. The distance between the tip of the fan blade and the centre is 12 cm. Calculate the frequency and the period of rotation of the fan.

Homework Read Section 3. 2 Questions p. 118 #1 -6