Momentum is the product of an object's mass and velocity. In the case of a biker dragging their foot, the momentum would be calculated by multiplying the mass of the biker's foot by the velocity at which it is being dragged.
When a biker drags their foot, it increases the surface area of the biker making contact with the ground. This results in an increase in friction and a decrease in the biker's velocity, therefore decreasing their momentum.
No, dragging a foot will always result in a decrease in momentum due to the added friction and decrease in velocity. In order to increase momentum, the biker would need to increase their velocity or mass.
Momentum and energy are directly related. When a biker drags their foot, the decrease in momentum leads to a decrease in kinetic energy (the energy of motion) as well. This is because energy is conserved and any decrease in momentum must be compensated for by a decrease in energy.
The decrease in momentum when dragging a foot can be minimized by reducing the amount of friction between the foot and the ground. This can be achieved by wearing appropriate footwear and avoiding dragging the foot for extended periods of time.