Phy106Energy

Phy106Energy - Energy What is Energy From Merriam Webster:...

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Unformatted text preview: Energy What is Energy From Merriam Webster: Energy: The capacity for doing work (or to produce heat ) What are some forms/types of energy? 1. Energy of motion (kinetic energy) 2. Heat 3. Electricity 4. Electromagnetic waves - like visible light, x-rays, UV rays, microwaves, etc 5. Mass Huh, what do you mean mass is a form of energy? Well get to this later. The thing about energy is that it cannot be created or destroyed, it can only be transformed from one form into another From Merriam Webster: Energy: The capacity for doing work (or to produce heat ) What are some forms/types of energy? 1. Energy of motion (kinetic energy) 2. Heat 3. Electricity 4. Electromagnetic waves - like visible light, x-rays, UV rays, microwaves, etc 5. Mass Huh, what do you mean mass is a form of energy? Well get to this later. The thing about energy is that it cannot be created or destroyed , it can only be transformed from one form into another Energy Conservation Like momentum, energy is a conserved quantity. This provides powerful constraints on what can and cannot happen in nature. This is an extremely important concept, and we will come back to this over and over throughout the remainder of the course. Kinetic Energy Energy of Motion Kinetic energy (KE) refers to the energy associated with the motion of an object . The kinetic energy is simply: KE = ()mv 2 where m = mass in [kg], and v = velocity of object in [m/sec] What are the units of KE? [KE] = [mass] [velocity] 2 = [kg*m 2 /s 2 ] == [Joule] or just, [J] A Joule is a substantial amount of energy! Kinetic energy (KE) refers to the energy associated with the motion of an object . The kinetic energy is simply: KE = ()mv 2 where m = mass in [kg], and v = velocity of object in [m/sec] What are the units of KE? [KE] = [mass] [velocity] 2 = [kg*m 2 /s 2 ] == [Joule] or just, [J] A Joule is a substantial amount of energy! Energy The unit, [Joules] applies to all forms of energy , not just KE. As well see later, there are sometimes more convenient units to use for energy. You have probably heard of the unit Watt. For example, a 100 Watt light bulb? A Watt [W] is simply energy usage per unit time, or [J/s]. So, 100 [W] means the bulb uses 100 [J] per second! How many [J] are used by a 100 [W] bulb in 2 minute? A) 200 [J] B) 1200 [J] C) 12000 [J] D) 2000 [J] The unit, [Joules] applies to all forms of energy , not just KE. As well see later, there are sometimes more convenient units to use for energy . You have probably heard of the unit Watt. For example, a 100 Watt light bulb ? A Watt [W] is simply energy usage per unit time , or [J/s]....
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Phy106Energy - Energy What is Energy From Merriam Webster:...

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