cool but not cool?

when my bit goes in reverse it spins the tires but when it goes forward it doesnt is the motor in back words or what?

[vwarner]

Its the same as big cars, front wheel cars spin easy in drive, but hard in reverse.
Rear wheels drive cars spin easy in reverse but not in forward.

[Acceptable_Risk]

It's just the nature of the drive train. With rear wheel drive, when accelerating forwards, it shifts weight to the rear and increases downforce, and therefore traction, on the back tires. When in reverse, the opposite happens.