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Physics is the science of matter and its motion, mainly mass, force,…
Physics is the science of matter and its motion, mainly mass, force, energy and charge.
Physics is the purest science, after Maths
Everything that happens eventually finds its way to physics (e.g. anatomy, chemical reactions, force, etc.)
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If you take things from a different perspective, the things may change
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Pendulums
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the energy that the pendulum has will not be lost, like a ball being dropped from a specific height and losing its energy to heat/sound, making it bounce to a lower height compared to the height that it was dropped from at the start.
TERMS:
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oscillation: a rotation in which the pendulum swings from a certain distance from the equilibrium to the opposite side and back
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the amplitude when the pendulum comes back will be almost exactly the same from which you first released it
this is because the smallest drag occurs, causing the smallest amount of energy to be lost
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Energy
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Light Energy
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Can come from light bulbs, fire, etc.
Gravitational Energy
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Higher the object, the more gravitational energy it possesses
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Chemical Energy
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Found in food, batteries, wood, petrol and cells of all living things
Potential Energy
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3 types of potential energy: elastic, chemical and gravitational
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Energy efficiency is the amount of supplied energy that is useful. Energy that is supplied but not used in the intended way is called waste energy
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Snakey diagrams:
- energy flow shown as large arrow going from left to right
- if some energy is TRANSFORMED then small arrows split off from the main one
- RULES:
1. thickness of the arrow indicates the amount of energy goes to it
2. the input and output energy is equal, therefore, the thickness of the output arrows should be equal to the combined thickness of the input arrows
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