RRCS MOBILE
 BACK VARIOUS NOTES: MOTION & ENERGY NOTES Motion & Energy Vocabulary● Motion - When an object's distance from reference point is changing.● Reference Point - An object or location used for comparison to determine if an object is in motion.● Distance - The amount of space between 2 objects or points.● Speed - The distance ant travels in 1 unit of time. s=d/t or speed equals distance divided by time.● Average Speed - The total distance/total time.● Constant Speed - When an object travels at the same speed over an extended period of time.● Velocity - The speed and direction of an object.● Energy - The ability to do work or cause a change.● Kinetic Energy - The energy of moving things.● Potential Energy - Energy an object has due to an object’s position or condition.● Elastic Potential Energy- Energy an object has that is stretched or compressed.● Gravitational Potential Energy - Potential energy due to the height of an object and the force of gravity acting on the object.● Mechanical Energy - The potential and kinetic energy of a moving object.● Thermal Energy - The energy of the particles in a substance or material.● Chemical Energy - The potential energy a substance has due to the chemical bonds that hold it together.● Electrical Energy - Energy of moving electrons which creates electricity and currents.● Electromagnetic Energy - The energy in light waves, microwaves, infrared radiation andultraviolet waves.● Nuclear Energy - Potential energy stored in the nucleus of an atom. Caused by the forcesholding the parts of the atom together.● Work - Moving an object over a distance.MORE Motion & Energy Notes...These give even more details :-)I. Motion - An object is in motion when the distance between it and another object or point is changing.A. Motion can only be judged by using a reference point or frame of reference.1. Think about closing your eyes while riding in a car on a smooth highway -it doesn’t feel like you are moving, but if you look out the window you cantell.2. We are in constant motion as the earth spins and revolves around the sun- we move at around 800 miles per hour as Earth spins and 66,000 milesper hour as Earth revolves around the Sun. But we don’t feel either ofthese motions. Why?B. A reference point is a location or object that you can use to determine if an object is moving.1. If the distance between an object and a reference point is changing thenthe object is in motion. Most reference points are stationary - NOTmoving.C. Motion can be described in terms of its speed and its direction.II. Speed - The amount of distance an object travels in 1 unit of time.A. If you have measured the distance an object has travelled and how long it took itto travel that distance you can calculate speed.1. Formula for speed is speed = distance / time2. Speed can NOT be measured - it has to be calculated.3. The unit for speed is always a distance per time - miles per hour,centimeters per minute, meters per second, etc..B. Constant speed is when an object travels at the same speed over an extendedperiod of time.C. Variable speed is when an object speeds up or slows down - changes speed.D. Average speed is when you take the total distance travelled and divide it by thetotal time - it ignores the changes in speed during a trip and just gets an averagefor entire trip.III. Velocity - An object’s speed and direction.A. Velocity changes when the speed or direction or both change. Often describeswith compass directions example - going South at 60 miles per hour.I. What is Energy?A. Energy is defined as the ability to do work or cause a change.1. Work is defined as moving a mass a certain distance - more massor more distance equals more work!B. We use energy during every moment - energy is what allows us to move and ourheart to beat. Energy propels cars and runs our computers.C. Two main categories of energy - Kinetic and PotentialD. Kinetic Energy1. Kinetic energy is the energy of a moving object - the amount of kineticenergy an object has depends on the speed of the object and the mass ofthe object.E. Potential Energy1. Potential energy is energy an object has due to its position or itscondition.2. Some object have energy because they are stretched out orcompressed like rubber bands or springs. Some objects have energy because of wherethey are - a car at the top of a steep hill.II. Forms of Energy - 8 forms of energy that we will learn - some are just potential or kineticbut many are a combination of both categories.A. Gravitational Potential Energy1. Potential energy an object has because of the force of gravity actingupon it.2. A bowling ball on the roof of a building has a lot of potential energybecause gravity is pulling it down - if I drop it onto a teeter-totter I couldmake something fly up.3. The amount of energy depends on the strength of gravity and the heightof the object from the source of gravity.B. Elastic Potential Energy1. Potential energy an object has because it is either stretched orcompressed.2. Common examples are rubber bands and springs.C. Mechanical Energy1. The energy in a moving object - a combination of potential and kineticenergy.2. As a person swings on a swing set their energy is constantly changingback and forth between potential and kinetic. Except for when they are at the top orbottom they have both types of energy.D. Thermal Energy1. The kinetic energy that the moving particles have in a substance.2. The higher the temperature the faster the particles move and the higherthe thermal energy.3. Temperature is how we measure the thermal energy.4. Adding or subtracting thermal energy can cause a substance tochange state or phase.E. Chemical Energy1. The potential energy an object has due to the bonds that hold itsparticles together.2. This is the energy in food and gasoline.F. Electrical Energy1. The kinetic energy of moving electrons that create electricity.2. Electrical energy moves through wires to power our computers.3. Naturally occurs in lightening.G. Electromagnetic Energy1. The energy in light waves, infrared and ultraviolet radiation.2. Sunlight is electromagnetic energy and is the primary source of allenergy on Earth.H. Nuclear Energy1. The potential energy due to the bonds holding the parts of an atomtogether.2. This is the energy used in a nuclear reactor or nuclear bomb.a. In a reactor the release of the energy is controlled while in anuclear bomb the release is uncontrolled and almost instant.I. Sound Energy1. The kinetic energy that a sound wave produces in the stuff throughwhich it travels.2. No sound in space because there is nothing for the sound to travelthrough.3. Sounds are different underwater because the sound waves traveldifferently in water than through air.
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