Science

• Friction - The force that opposes the motion of two surfaces that are in contact with each other.
• Smooth surface = less friction
• Rough surface = more friction
• Rolling friction - is produced when an object rolls over a surface
• Bowling is what example of friction?

  Rolling friction
• Sliding Friction - is also called dry friction. It occurs when two objects rub against each other or slide each other
• Mopping the floor is what example of Friction?

  Sliding Friction
• Roller skating is what example of Friction?

  Rolling Friction
• Swiping the window is what example of Friction?

  Sliding Friction
• Fluid Friction - is friction between moving objects and a liquid between an object moving in the air
• A boat traveling in water is what example of Friction?

  Fluid Friction
• Swimming is what example of of Friction?

  Fluid Friction
• Static Friction - occurs in stationary objects at rest
• A mug placed on a flat surface is what example of Friction?

  Static Friction
• A book placed on a table is what example of Friction?

  Static Friction
• Energy is defined as the ability to do work
• Heat Energy - also known as thermal energy is made up of tiny particles which are in constant motion
• Light energy - photons, energy transferred by photons, photon energy transferred per second, photon energy transferred per unit area
• Light energy - is a visible form of radiant energy that travels in waves. It is only form of energy that can be detected by the human eye.
• What is another term of Heat Energy?

  Thermal Energy
• Solar Energy - to generate electricity with solar cells or heat engines
• Electrical Energy - is the energy produced by moving electrons
• Sound Energy - is produced in different ways. The simplest way is when objects hit each other. - produced came from the kinetic energy lost when moving bodies collide
• Sound is produced by making vibrations
• What parts of the ear is responsible for hearing?

  Eardrum
• What bones are responsible in carrying the energy to the brain through the auditory nerve?

  Hammer, anvil, & stirrup
• The theory of gravity was proposed by Sir Isaac Newton In 1687 in his book Principea Mathematica
• How did Isaac discovered gravity?

  An apple fell in his head
• Without gravity, everything on the Earth's surface will float in the atmosphere
• The larger the mass of an object, the more gravity
• Gravity is a force of attraction that exits between any two objects
• Conduction


  Tranfers heat through one object to another when in direct contact
• Frying vegetables in a pan is what example of tranferring heat energy?

  Conduction
• Convection


  Tranfers heat energy via air and liquids
• Heating milk is what example of transferring heat energy?

  Convection
• Radiation


  Warms the air using heat waves that radiate out of the hot object in all directions until absorbed by other objects
• In a microwave, the substances are heated directly without any heating medium. What kind of transferring heat energy is this?

  Radiation
• Chemical energy


  Is the energy stored in bond atoms and when bonds are broken, energy is released
• Chemical


  Food is what kind of energy?
• Chemical


  Batteries is what kind of energy?