Answer
Basically "popping a wheelie" is done by changing the center of mass to the rear wheel. When a bike is running, it is in equilibrium as the normal force that earth applies on wheels are balanced by gravity. During a wheelie this equilibrium is disturbed by unbalancing the torques of the wheels. We can do this by decreasing the load taken by front wheel until it is zero.
Work Step by Step
Basically "popping a wheelie" is done by changing the center of mass to the rear wheel. When a bike is running, it is in equilibrium as the normal force that earth applies on wheels are balanced by gravity. During a wheelie this equilibrium is disturbed by unbalancing the torques of the wheels. We can do this by decreasing the load taken by front wheel until it is zero.
