Buster

If a dog rode a skateboard, the wheels would roll because of friction with the ground, which produces torque. The sum of torques = Ia (rotational inertia times alpha, the angular acceleration), which is fR since friction is the only torque producing force and it acts the radius of the wheel away from the axis of rotation. For a disk/cylinder, I is 1/2MR^2, so for 4 wheels, it's 4 times that.

Side story: Joe and Emily painted a mural in 2000 that was located here previously. Mr. Curtis asked the next students to leave their names because it was a fun picture and because they dated in physics class and later got married!