"PARKWAY PLASTICS, INC."

Economical pulley for simple machine experiments.

Economical pulley for simple machine experiments.

Economical pulley for simple machine experiments.

Economical pulley for simple machine experiments.

Economical pulley for simple machine experiments.

Economical pulley for simple machine experiments.

Economical pulley for simple machine experiments.

Pulley with metal clamp attached.

Plastic pulley with two- part aluminum frame.

Plastic pulley with metal clamp, includes knob for tightening.

Kit to demonstrate force experiments.

Jumbo-Sized Pulleys are Designed for Classroom Demonstrations

A redefined and extremely robust hand-held gyroscope.

High-speed pulley with low friction design mounted on a rod for easy integration into experiments.

Switch between two different speeds for this powered uniform motion car.

Explore rotational acceleration with this pair of variable inertia disks.