Homework Help: physics

Posted by Bella on Saturday, February 21, 2009 at 1:30pm.

there are 3 parts to my question. i need help on the last part.

1.a. A child rides a bike in a circular path with a radius of 2.0 m. The tangential speed of the bike is 2.0 m/s. The combined mass of the bike and the child is 43 kg. What is the magnitude of the bike's centripetal acceleration?

i got 2.0 m/s^2

b., What is the magnitude of the centripetal force on the bike?

i got 86 N

c. What kind of force provides the centripetal force on the bike?

i don't know,... gravitational force, friction, air resistance, or normal force

thanks for the help!

physics - drwls, Saturday, February 21, 2009 at 2:57pm
c. A centripetal friction force on the wheels, applied at the ground and perpendicular to the direction of motion, provides the force that keeps the bike going in a circle

Spokes provide the centripetal force toward the axle of the wheel, but they did not ask for that.
physics - Bella, Saturday, February 21, 2009 at 3:04pm
so friction
physics - drwls, Saturday, February 21, 2009 at 3:13pm
Friction in a particular sideways direction. There is also forward/backward friction when accelerating, decelerating or climbing hills

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