Energy
Energy - the thing that lets us make changes. (The ability to do work)
It is the most important thing in the universe.
ENERGY IS ALWAYS CONSERVED IN THE UNIVERSE - Einitial = Efinal
Energy can not be created or destroyed, only transferred.
Measured in Joules,
It is the most important thing in the universe.
ENERGY IS ALWAYS CONSERVED IN THE UNIVERSE - Einitial = Efinal
Energy can not be created or destroyed, only transferred.
Measured in Joules,
- 1 Joule = 1 (kgm^2)/s^2 = 1 Nm
Types of Energy
1. Kinetic Energy (Ke, Ek) - Energy stored in the motion of mass.
- Dependent on the velocity and mass of the object.
- Dependent on the position of the object.
- Doesn't necessarily have to be an equal split.
- Measured by distance between objects, Dependent on mass and height.
- Dependent on spring constant and distance stretched.
- Dependent on temperature. Temperature is measured in kinetic energy.
Energy Transfers:
- Working (W) - External push or pull on a system, when an outside force is applied.
- Radiating (R) - Matter loses energy by radiating light and gains energy when it absorbs light.
- Heating (Q) - Temperature (average kinetic energy) difference causes energy to transfer from a warmer object to a cooler one.
LOL Charts - these diagrams are a way to represent how the energy is stored in the chosen system during various snapshots and to represent any changes in total energy for the system. Each “L” represents how the energy is stored during a particular snapshot (instant).
Work - the transfer of energy
Positive work - Energy transferred into the system. Ef > Ei
Negative work - Energy transferred out of the system. Ef < Ei
We only care about the work done in the direction of the displacement.
W = F * ∆ x
W = Force parallel to displacement * displacement
Area under a Force vs. displacement graph is the energy transferred through working
Negative work - Energy transferred out of the system. Ef < Ei
We only care about the work done in the direction of the displacement.
W = F * ∆ x
W = Force parallel to displacement * displacement
Area under a Force vs. displacement graph is the energy transferred through working
Power
Power is the rate of doing work or transferring heat, the amount of energy transferred or converted per unit time. Having no direction, it is a scalar quantity.
Power = work/time
1 joule / second = 1 watt
1 horsepower = 746 watts
Power = work/time
1 joule / second = 1 watt
1 horsepower = 746 watts
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