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Transcript
Warm-up: What types of energy do you think are shown in the video? 1) … 2) … 3) Cooking with Snoop Intro to Energy Chapter 9 What is Energy? Energy: the ability to do work. Work: done when a force causes an object to move in the direction of the force. Work a transfer of energy. Work & Energy are measured in joules (J). What is Energy? KINETIC CHEMICAL ELASTICPOTENTIAL Two Types of Energy Potential Energy is the energy of position. Kinetic Energy is the energy of motion. Kinetic Energy Kinetic energy is the energy of an object due to its motion. All moving objects have kinetic energy. We can determine how much kinetic energy an object has with this formula: KE = mv2 2 m = mass in kilograms (kg) v = velocity (speed) in meters per second (m/s) (not Volume!) Practice A car weighing 1,200 kg is moving at a speed of 20 m/s, what is its kinetic energy? KE = 1,200 (20)2 2 KE = 1,200 (400) 2 KE = 480,000 2 KE = 240,000 J Potential Energy Potential energy is the energy of an object due to its position, shape, or condition. Potential energy is also considered to be an object’s stored energy. Two types of potential energy: Gravitational Potential Energy Elastic Potential Energy Gravitational Potential Energy Gravitational Potential Energy is the energy stored in an object due to the Force of Gravity. We can determine how much gravitational potential energy an object has with this formula: GPE = w x h w = weight in newtons (N) h = height in meters (m) Practice A ball weighing 13 N is held at a height of 1.5 m, what is its gravitational potential energy? GPE = 13 x 1.5 GPE = 19.5 J Elastic Potential Energy Elastic Potential Energy is the energy stored in an object from being stretched or wound-up.
