Matter and Energy

Matter and Energy

1. Forms of Energy

   • Kinetic Energy
     • Is the energy an object has because it is moving. The faster something moves, the more kinetic energy it has.
   • Potential Energy
     • Is stored energy based on an object’s position or condition. It has the potential to do work in the future.
   • Thermal Energy
     • Thermal energy is the energy that comes from the motion of particles within matter.
   • Chemical Energy
     • Is stored in the bonds between atoms and molecules. When these bonds are broken or formed during chemical reactions, energy is released or absorbed.
   • Electrical Energy
     • It comes from the movement of charged particles. Powers devices when electricity flows through a circuit.
   • Light Energy
     • Is a form of electromagnetic radiation, carried by electromagnetic waves.
   • Sound Energy
     • Is produced by vibrating objects and travels through air, water or solids.
   • Mechanical Energy
     • Is the total energy of motion and position of an object. It combines kinetic and potential energy.

2. Law of Conservation of Energy

   • The law of conservation of energy says that energy cannot be created or destroyed, it only changes form
   • Energy Transformations Examples:
     • Example: Electrical → light (in a bulb).
     • Battery: Chemical → electrical.
     • Toaster: Electrical → thermal.
     • Roller coaster: Potential → kinetic.

3. Energy and Motion

   • Force
     • A force is a push or pull that can cause an object to move, stop, or change direction.
   • Motion
     • Motion is the change in position of an object over time.
   • Speed
     • Speed measures how fast an object moves. It’s calculated by dividing the distance traveled by the time it takes.
   • Acceleration
     • Acceleration is any change in speed or direction. An object accelerates when it speeds up, slows down, or turns.
   • Relation between mass, motion, and energy
     • Objects with more mass or that moves at higher speeds have more energy, specially kinetic.
   • Newton's Law
     • Isaac Newton's three laws explain how forces affect motion:
       • 1. Objects stay at rest or in motion unless acted on by a force.
       • 2. Force equals mass times acceleration (F = ma).
       • 3. For every action, there’s an equal and opposite reaction.

4. Thermal Energy and Heat Transfer

   • Different Heat Trransfers
     • Conduction: Heat transfer through direct contact.
       • Example: When a metal spoon sits in hot soup, the heat moves from the soup to the spoon’s handle
     • Convection: Heat transfer through the movement of fluids. Warm parts rise and cooler parts sink, creating a cycle
       • Like boiling water or air currents.
     • Radiation: Heat transfer through electromagnetic waves. It doesn't need matter to travel.
       • By radiation sunlight warms the earth through space.
   • Heat vs Temperature
     • Temperature: The measure of how fast the particles of a substance are moving. Higher temperature means particles move faster and have more energy.
     • Heat: The energy that moves from a warmer object to a cooler.
   • Thermal Expansion
     • When materials are heated, their particles move faster and spread out, causing them to expand.