Accurately measure the velocity of your dynamics cart.

• Dual marking scales: one 50 mm bar, and 13 alternating clear and black bars, with an interval of 10 mm
• Intended for use with Vernier dynamics carts

The cart picket fence is a small plastic strip for doing photogate motion timing with dynamics carts. When the cart picket fence passes through a photogate, the cart’s velocity and acceleration as a function of time can be accurately measured.