Wednesday

August 20, 2014

August 20, 2014

Posted by **Kammi** on Friday, December 1, 2006 at 8:48am.

First (technical question) why don't bikes move backward when you pedal backward?

On to the physics. A string is tied to a bike enabling one to pull the pedal from the down position (so that the pedals are turining in a clockwise fashion instead of counter clockwise) from in front of the bike. The bike moves forward. Why does this occur?

My answer involved the force (and torque) being large and in the direction forward where the bike would move. Any friction from the gears, etc. would be overcome.

Some bikes can go backwards...I am thinking of the bikes used by acrobatics on circus high wires.

Normal bikes cant petal backwards because of a clutch that allows the rear wheel to turn faster than the pedals.

The string on the petal is mechanically linked (string, petal, chain, rear wheel hub, rear wheel) to the rear wheel which moves the bike forward.

is the front of the bycycle facing lerf or right?

**Related Questions**

Math - Division - I can't quite solve this question. Of 98 bicycles in a bike ...

math - A factory produces bicycles at a rate of 80+0.3t^2−1.1t bicycles ...

economics - Suppose we have the following market supply and demand schedules for...

math - a cycle company make bicycles, tricycles an unicycles. Last week they ...

Math - The owner of a bicycle factory said about 15,000 bicycles were made last ...

economics - Suppose that bicycles are produced by a perfectly competitive, ...

Math - Pedro built nine bicycles in 25 h. At this rate, how many bicycles will ...

Algebra - The RideEm Bicycles factory can produce 140 bicycles in a day at a ...

College Algebra - A company builds bicycles. Their fixed cost is 300,000 and it ...

Math - Solve the following problem. The owner of a toy store is taking inventory...