Help students to visualize and grasp Newton's Second Law of Motion! This sturdy unit demonstrates that a horizontally projected ball and vertically dropped ball land at the same time. The spring device can propel a ball up to 48 inches from its
Help students to visualize and grasp Newton's Second Law of Motion! This sturdy unit demonstrates that a horizontally projected ball and vertically dropped ball land at the same time. The spring device can propel a ball up to 48 inches from its