These engaging lessons (GOOGLE and PDF versions) allow students to develop an understanding of the relationship between gravitational potential energy, the mass of an object, and the height of the object, and also how energy is transferred when two objects interact. This activity supports the NGSS standard MS PS3-2A review (or introduction) of the key terms kinetic energy, potential energy, the law of conservation of energy, the connection between force and energy, and mass is given.Students wil