The Weighted Car Test is an interactive Montessori science activity designed for upper elementary (grades 4–6) students to investigate whether weight affects the speed of objects rolling down a ramp. This self-contained shelf work is perfect for a Forces of Motion unit and reinforces key physics concepts such as gravity, acceleration, and friction. Students will: Compare two toy cars—one heavier, one lighter—created by adding weights to one car Predict which car will reach the bottom of