physics and bicycles

I have aq uick question about bicycles relating to physics. I hope you can understand this!

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?

  1. 👍 0
  2. 👎 0
  3. 👁 156
asked by Kammi

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics;Help!!!!!!

    There is apparently no one online who can help with physics questions right now. Please check back later to see if a physics teacher has addressed your question. Multiple posts won't get faster answers. Thanks. =) The question is

    asked by Writeacher on June 7, 2007
  2. Math

    I'm using the quadratic equation and I understand how to use it, but the format my text book gives the answers in is what I don't understand. If I have (2+/-Sqrt(8))/2 I know that x can either equal 2.41 or -0.14 However, my

    asked by Sam on January 10, 2010
  3. math

    A factory produces bicycles at a rate of 80+0.3t^2−1.1t bicycles per week (t in weeks). How many bicycles were produced from day 15 to 21?

    asked by saud on December 4, 2011
  4. physics

    thanks for the help earlier just got a question I'm taking AP Physics B this year does that mean next year I would Take AP Physics C??? I don't know if the material in C convers the same material plus the additional calculus

    asked by physics on August 9, 2009
  5. math

    a cycle company make bicycles, tricycles an unicycles. Last week they made 120 more bicycles than unicycles, and 4 times as many tricycles as unicycles. If they made 75 more bicycles than tricycles, how many unicyles did they

    asked by jenny on April 10, 2013
  6. Math Calc

    A factory produces bicycles at a rate of 100+0.4t2−0.7t bicycles per week (t in weeks). How many bicycles were produced from day 15 to 28? Hint: the lower limit of integration should be the integer number of weeks preceding day

    asked by Ellie on April 28, 2015
  7. physics As

    The table below shows how the braking distance x for a car depends on its initial speed u u / ms-1 5.0 10 20 4 x / m 2.0 8.0 32 128 the reaction time of a driver is 0.60s. Calculate the sopping distance of the car when u= 30ms-1.

    asked by cylinder on December 4, 2017
  8. Math - Division

    I can't quite solve this question. Of 98 bicycles in a bike rack, 67 are mountain bikes. What fraction of the bicycles are not mountain bikes?

    asked by Alex L. on October 3, 2011
  9. math

    A dealer bought some bicycles for $4,000. He sold them $6,200, making $50 on each bicycle. How many bicycles were here?

    asked by chris on November 5, 2016
  10. Math

    Pedro built nine bicycles in 25 h. At this rate, how many bicycles will he build in a 40 h week.

    asked by Anna on May 2, 2014

More Similar Questions