Use a small then large scale pulley system to feel the force differences as pulleys are added. Experiment with small pulleys to make a pulley system.
Science content (2016 curriculum):
Physics: Motion and Forces, Newton’s Laws, Gravity (K, 2, 6)
Physics: Simple and complex Machines (5)
Curriculum connection (2005 science topic):
Physical Science: Force and Motion (grade 1)
Physical Science: Forces and Simple Machines (grade 5)