why a two wheeler doesn't fall down while moving & fall down while not travelling?

Answer 1

momentum.

Objects in motion stay in motion unless acted upon by an outside force. Once you get moving, you stay moving in that direction. When you are stopped, the biggest force acting on you is gravity, which will make you tip over if you are not perfectly ballanced. In motion there are variety of forces (thrust, friction) that can overcome the force of gravity.

Answer 2

Motion: objects in motion, stay in motion. Physics.
Think of motion as walking. Walking is defined as controlled falling. A person who is walking is actually falling forward. The moving of the foot to balance the weight stops the fall. The subsequent lifting forward of the opposite leg initiates another fall which is stopped by the trailing foot being placed down in front of the body. So, on a 2 wheeler, the turning wheels are like the advancing feet and motion continues.

Answer 3

A two wheeler rides in a state of dynamic balance.
It never rides in a perfect straight line, but is constantly deviating from vertical and being corrected either by the rider or by the stable design of the bike.
When a bike is designed to be stable, then when it leans to one side it automatically turns the front wheel in the correct direction to bring it back upright. Hence - look mum, no hands!

When the bike is not moving, thses corrections cannot be made, unless the bike is designed so that when the front wheel is turned, it moves slightly to one side, so that a skilled rider can stop it from falling over.

Answer 4

only ted asnwered correctly.
in case u dont know gyroscopic couple, let me explain it.
fix a wheel on a shaft, allign it with x-axis and start rotating the shaft about its longitudinal axis.
now keep the shaft rotating, and simultaneously rotate the rotating shaft around z-axis in the x-y plane.
now if u try to move this shaft in some other direction, u will see that a couple starts acting on it,and tries to stabilize it.ths is called gyroscopic couple.
it is used in balancing systems such as rocket guiding mechanism, ship steering, aeroplanes,etc.


this same couple stabilizes two wheelers also, as u asked.

{ one more thing is worth noting.
there is a thing called degree of freedom.it is intimately connected to motion. scientists have made robots with only one leg(support/pod). it moves by jumping. when it is in motion, it has a maintained degree of freedom and the bot never falls down.but when it stands still, it falls down.similarly, if u have a rod with more than four or five links, and u want to make the rod stand vertical,it will definately fall down.but if u attach it with a slider crank mechanism,which vibrates it in the direction of desired balancing, after initial wobbling, the thing gets vertical!}
(it is a very interesting theory.u can try to learn more of it.its worthwhile the effort.)

Answer 5

A rotating wheel has gyroscopic inertia that causes it to resist changes in the orientation of its axis of rotation.

Imagine a non-rotating wheel. If it tips over and falls down, the top of the wheel follows an arch from its upright position to the ground. That is, initially when it falls the wheel moves almost parallel to the ground because it's at the top of that arch.

Now imagine the wheel is rotating. The top starts moving parallel to the earth but then rotates to the bottom of the wheel. When it is at the bottom of the wheel, it still has momentum carrying it parallel to the earth. However, on the bottom of the wheel this causes the bicycle to resist falling.

So the momentum imparted on parts of the bicycle is rotated to positions that cause that momentum to work against the original impetus to fall.

Answer 6

it has been discusses in a journal about bikes.
actually while you move you always and without undrstanding it you " correct" your route and balane al the time. while you move and the ofrce it taking you in front the minor ocrrection contribut the lest to the movement so there is not a direct effect contributing to losing balance as at rest since the vectors add up and almost fall on the vector of the force that moves the bike.

Answer 7

Mark Boucher

Answer 8

It is all about balancing.......if you balance the two wheeler, it will not fall down even in the state of rest.

Answer 9

the answer is d none of the above .in motion the wheels act as gyros and keer the bike upright same way gyros keep the space shuttle steady in space.and no gyros are not only sandwiches

Answer 10

yes coz of momentum n friction also contributes.....based on NEWTON laws of motion...refer d 3 laws to understand