ENERGY AND WORK Say whaaaat? WHAT IS ENERGY? • energy - the ability to do work or cause change WHAT IS WORK? • work - force exerted on an object that causes it to move (transfer of energy) TWO MAIN TYPES OF ENERGY • Kinetic Energy - energy of motion • Potential Energy - stored energy KINETIC ENERGY • depends on mass and velocity • Formula: • • KE = (mv2) / 2 Units: • Joules (J) POTENTIAL ENERGY • stored energy • Formula (PE gravitational): • PE = mgh • Units = Joules (J) WHAT IS A JOULE? • Named after James Prescott Joule • studied work (physics) in the 1800’s • One Joule is the amount of work you do when you exert a force of one newton to move an object one meter. VOCABULARY • energy - the ability to do work or cause change • work - force exerted on an object that causes it to move • kinetic energy - energy that an object has due to its motion • potential energy - energy that is stored VOCABULARY • elastic energy - potential energy stored in stretched or compressed objects • gravitational energy - potential energy that depends on the height of an object • mechanical energy - kinetic or potential energy associated with the motion or position of an object VOCABULARY • thermal energy - the total energy of the particles in an object, heat energy • chemical energy - the potential energy stored in chemical bonds • electrical energy - the energy of moving electric charges VOCABULARY • electromagnetic energy - the energy of light and other forms of radiation • nuclear energy - the potential energy stored in the nucleus of an atom • joule - a unit of work equal to one newton-meter IF YOUR STUCK ON KE DO THIS 1. SQUARE VELOCITY. 2. MULTIPLY THAT ANSWER BY MASS. 3. DIVIDE THAT ANSWER BY 2.