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8.5 Gravitational Potential Energy SWBAT describe and calculate Gravitational Potential Energy A 15 kg mass is moving at 7.5 meters per second on a horizontal, frictionless surface. What is the total work that must be done on the mass to increase its speed to 11.5 meters per second? 7.5 m/s 1. 2. 3. 4. 165.8 m/s 38.8 m/s The bullet with the greater mass; 2 to 1 2.4 J, 9.6 J; the bullet with the greater speed; 1 to 4 5. 1.6 x 103 kg Potential Energy is energy an object possesses due to its position or condition. Definition: GPE is the potential energy stored in the gravitational fields of interacting bodies. GPE depends on height from a “zero level” (normally the ground). (If something is above the ground, it has GPE) Units: Joules (J) Equation: How can we change this formula? GPEGPE = mgh = Fg h = mgh (Gravitational Potential Energy)= (mass)(gravitational field strength)(height) = (Weight)(height) Where is the formula for Gravitational Potential Energy? A 20 kg crate is lifted a distance of 5 meters. What is the gravitational potential energy of the block when it is 5 meters above the ground? How much work is done on the crate? 5m While riding a chairlift, a 800 N skier is raised a vertical distance of 500 meters. What is the total change in the skier’s gravitational potential energy? What is the work done against gravity?