KINETIC AND POTENTIAL ENERGY WORKSHEET Potential energy (PE) = mgh Kinetic energy (KE) = 1/2 m v2 Total mechanical energy = PE + KE Name:________________________ Take notes from Power Point: Potential energy sample question: A block is sitting on a platform 20 m high. It weighs 50 kg. How much Potential energy does it contain? Kinetic energy sample question: You serve a volleyball with a mass of .05 kg. The ball leaves your hand with a speed of 30 m/s. Total mechanical energy sample question: What is the Mechanical energy when the pendulum is at the high point (height=2 m)? Kinetic energy sample question: What is the kinetic energy when the pendulum is at the halfway point (height=1 m) when the total mechanical energy is 4 J (from previous question)? Directions: Write down the definition for each from your Cornell notes ENERGY: KINETIC ENERGY: POTENTIAL ENERGY: LAW OF CONCERVATION OF MATTER ENERGY TRANSFORMATION KINETIC AND POTENTIAL ENERGY WORKSHEET Potential energy: PE = mgh Kinetic energy: KE = 1/2 m v2 Total mechanical energy: ME = PE + KE Practice problems: 1. A baby carriage is sitting at the top of a hill that is 21 m high. The carriage with the baby weighs 12 Kg. The carriage has ____________ energy. Calculate it. 2. A car is traveling with a velocity of 40 m/s and has a mass of 1120 kg. The car has ___________energy. Calculate it. 3. A cinder block is sitting on a platform 20 m high. It weighs 79 N. The block has _____________ energy. Calculate it. 4. There is a bell at the top of a tower that is 45 m high. The bell weighs 190 N. The bell has ____________ energy. Calculate it. 5. A roller coaster is moving 10 m/s and a mass of 7 kg. The roller coaster has ____________ energy. Calculate it. 6. What is the mechanical energy of the cart on the right at position A. The cart is not in motion. (height=15 m, mass = 12 kg, gravity = 10 m/s2)? 7. What is the kinetic energy when the moving cart is 2/3 the way down (height=5 m) when the total mechanical energy is _____________ (from previous question)?