- Slides: 14
Energy Kinetic Energy Forms of Energy Potential Energy
Forms of Energy There are five • Mechanical – matter in motion has mechanical energy • Heat – internal motion of particles releases heat • Chemical – energy used/released that forms or breaks bonds • Electromagnetic – this is any moving electric charges including light. Electric power lines and motors, X-rays and radio waves • Nuclear – when a nucleus splits or fuses this energy is released or used. The sun’s energy is nuclear.
Mechanical Energy Water in a waterfall or a car moving has mechanical energy. You walking, running or riding a bike have mechanical energy Sound
Heat Energy Rub your hands together for several seconds and feel the heat. You have converted mechanical energy into heat energy. Often causes changes in the temperature and phase of any form of matter.
Chemical Energy The chemical energy stored in food is converted to ATP and used to power your activities.
Electromagnetic Energy Moving electric charges such as those in power lines bringing electricity to your house. Everything on the electromagnetic spectrum has this energy including visible light.
Nuclear Energy When a nucleus splits nuclear energy is released in the form of heat and light. Or When nuclei collide at high speeds and fuse then nuclear energy is released. This happens in the sun.
Kinetic Energy is energy of motion. When you walk, run, swim and jump, you have kinetic energy.
Kinetic Energy The faster an object moves, the more kinetic energy it has. So kinetic energy is directly related to the velocity of an object. In baseball, a fast ball has more kinetic energy than a slow curve. You have more kinetic energy when you ______than when you ______.
Kinetic Energy A battleship that is moving at 40 km/hr has much more kinetic energy than a mosquito moving at the same velocity. So kinetic energy must depend on something other than just velocity. The battleship has more kinetic energy because it has greater mass.
Potential energy is energy stored in an object due to its position.
Potential energy Stretch a rubber band between your thumb and index finger. Keep the rubber band stretch without any motion. How long can you hold it this way? After a short while you begin to sense the energy in the rubber band. Yet the rubber band is not moving! The stretched rubber band has energy stored in it. You cannot see this energy, but you know it is there because the stretched rubber band can do work as it returns to its normal shape.
Energy Conversions Changes in the forms of energy are called energy conversions. One of the most common energy conversion involves the changing of potential energy to kinetic energy OR kinetic energy to potential energy.
Energy Conversion Can you think of an example of an energy conversion? Either Kinetic to Potential OR Potential to Kinetic? How about in your Egg Bungee Jump?