Introduce forces with the coin game. Coin game and catapult to show chains of forces. Air resistance with older students to show forces combining.
Science content (2016 curriculum):
Physics: Motion and Forces, Newton’s Laws, Gravity (K, 2, 6)
Curriculum connection (2005 science topic):
Physical Science: Force and Motion (grade 1)
Physical Science: Forces and Simple Machines (grade 5)