D1

I believe that the most frequently used simple machine is the wheel and axle. You use this simple machine when you are riding bike down the street. It is used when you open the door and close the door. A doorknob is a wheel and axle. It is used when you drive a car down the street. The wheels are wheels and axles and also the steering wheel is a wheel and axle. In conclusion that is why I believe the wheel and axle is the most frequently used simple machine.