Here's the classic way to demonstrate the Resolution of Forces, Uniform & Accelerated Motion plus Kinetic and Potential energy. Rugged PVC protractor has a high resolution scale.

• Includes Halls cart to hold weights (Weights not included)
• 60 x 10cm Wood incline hinged to wood base
• Metal Pulley
• Protractor
• 2 Friction boards
• Weight Pan w/string.