Transcript Centripetal Force

Section 2: Centripetal Force
Warm Up:
1) Define Force:
2) Define Acceleration:
The acceleration is always in the
direction………
Centripetal Force:
Force required to keep
an object in circular
motion.
Centripetal Force Discovery:
• What direction is the centripetal force in?
• What happens to the force as the angular speed
increases?
• What happens to the force as the Radius increase?
• What happens to the force if the tangential velocity stays
the same and radius decreases?
Centripetal Force Properties:
1) Centripetal Force Direction:
2) If the Tangential Speed increases the centripetal force
will:
3) If the Angular Speed increases the centripetal force will:
4) If the radius decreases and the velocity stays constant
the centripetal force will:
5) Which will have the greatest centripetal force
Which has the greatest
centripetal force
Two candies are placed
on a spinning table,
which one will have the
greatest centripetal
force.
Demo:
1) Water Bucket
Demo:
Flame
Demo:
Penny and Hanger
Wet towel
Technology Applications
• Racetrack
• Engine blade and design
• Steel wire in tires and
treads: everything but
chains are good on ice
Centripetal Force Derivation
Newton 2nd Law: F = mxa
For Centripetal Force “Fc”
Fc=mxac
where ac – centripetal Acceleration
ac=Vt2/r
Centripetal Force Equation
Sample Problem 1: A 8kg weight is spun at 3m/s at a
radius of 1 meter before being thrown. Find the
following.
a) Centripetal Acceleration
b) Centripetal Force
Sample Problem 2:
Find the normal force at the following locations if
the cart has a mass of 10kg: