How much force does a fan create? How does a sail boat move against the wind?
By using this cart with a fully adjustable sail these questions and more can be answered in quantitative experiments. Use the power of wind to study Newton's laws of force and reaction. Show students that forces are vectors with a magnitude and direction. The cart is made of a durable but light weight plastic and measures 7" x 3" (not including wheel width). The sail which is also made of plastic is adjustable to any angle and is 9" x 5 3/4". Comes with instructions. External fan source not included.