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ENERGY - Coggle Diagram
ENERGY
Essay Notes
Work is like 'working out' or 'working up' more of a sweat, energy expended
Delta symbol signifies a change in energy, the energy gained by the object but also the energy lost by the person. Delta E is also called the work
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Work is a transfer of energy between the system and the surroundings, and we can also write W = F x d
The units for energy/work are kg x m^2/s^2, and this is equivalent to N times m. The units are often represented with a just J, standing for a Joule.
Stored energy, like when holding a rock you're about to drop is called potential energy.
In cases where the potential energy is present because the force of gravity is pulling downwards on the rock, we will call this gravitational potential energy (GPE).
If there was no gravity present, there would be no gravitational potential energy.
As you transfer energy to the rock, you do work on the rock, which means the amount of energy you lose is W = F x d, and the amount of energy the rock gains is this same W = F x d.
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The force you are lifting with is basically the weight of the rock and W = mg, so we substitute mg for F (assuming you lift the rock very slowly).
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When the height is 0, the PE _g would have to be 0 too.
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The amount of kinetic energy an object possesses depends on how fast the object is moving and on how much mass the object has. You can derive the kinetic energy equation starting with the velocity equation and Newton’s 2nd law.
If you push with twice as much force, you give the object twice as much energy, or if you push over twice the distance, you give the object twice as much energy, and this is written as delta E = F x d
Other Notes
If there is energy, you will do work.
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You have to apply force to move the table, changing the position of table
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Like when running, applying force to change your distance
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Energy can come in ways of light, sound, water, heat, etc.
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Ball on top of hill has potential energy, moving converted into kinetic energy, hits bottom and makes sound, converted into sound energy, etc.
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More mass the object has, the more inertia it has and the harder it is to accelerate/change the velocity
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GPE depends on gravitational potential, gravity and mass and height
All objects have GPE if on specific height, when moves transformed to kinetic energy
Worksheet Notes
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If you push with more force, it will give the object more energy, and you lose potential energy when it transfers to kinetic energy, and if pushed over a greater distance, there will be more energy.
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When the velocity of a car is tripled the KE of the car goes up 9 times since it's 3 squared for the velocity equation.
Person gives energy to box when lifting and moving with increasing speed, but not putting it down.
When velocity of car halves, KE of car also goes to 1/4
If you push all day on a stationary wall, you do not do work on the wall because the wall is not moving a distance, you are adding energy but no work on the wall specifically.
Equations
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PE (potential energy): m x g x h, where m = mass, g = gravity, and h = height.
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