Science

• Gravity - is a force that pulls everything towards the ground.
• Mass - amount of matter present in an object.
• Noncontact force - Acts between objects even if they are separated and far from each other.
• Contact Force - Any force that acts between two objects that acts when two objects come in contact.
• Friction - is a force that opposes motion between two surfaces in contact with each other.
• Static friction - keeps objects at rest.
• Sliding friction - when an object slides at an another object.
• Rolling friction - When an object rolls at an another object.
• Fluid friction - when a solid goes through a fluid.
• Energy - the ability to do work or make changes in certain conditions
• Potential energy - energy stored in an object at rest
• Kinetic energy - energy in motion
• Gravitational force - prevents objects from floating
• Mechanical energy - It is the sum of potential energy and kinetic energy
• Electrical energy - it is the energy possessed by moving electrons
• Renewable Energy - Energy sources that won't run out within human existence
• Non-renewable energy - Energy sources that will run out within human existence
• The Law of conservation of energy - Energy cannot be created or destroyed, only transferred from one form to another
• Solar energy - The energy from the sun that is used to generate electricity.
• Hydropower energy - water is used to turn a turbine to generate electricity
• Tidal energy - energy from the tides, where the tides are high and low
• Biomass energy - energy from living organisms, such as plants and animals.
• Wind energy - A form of renewable energy that uses wind to generate electricity.
• Geothermal energy - Energy from the Earth's interior, such as hot rocks or magma.
• Nuclear energy - Energy from fission reactions
• Fossil Fuels - Coal, oil, and natural gas.
•  Energy transformations - processes that convert energy from one type (e.g., kinetic, gravitational potential, chemical energy) into another.
• Simple machines - Is any several devices with no moving parts that are used to modify motion and force in order to perform work
• Inclined plane - Is a slope that makes it easier to raise load
• Wedge - Objects with two inclined planes positioned back to back that tapers to a thin edge
• Lever - A long beam or bar that rests or turns or lifts on support or fulcrum.
• Wheel and axle - made up of a circular frame (wheel) that revolves on a shaft or rod (axle)
• Screw - A long inclined plane wrapped around a shaft. A shaft is a circular cylindrical thing with a continuous winding or spiral rib.
• Pulley - a wheel that carries flexible rope, cord, cable, chain, or belt on its rim
• fixed pulley -  the simplest form of pulley. The wheel is fixed to one-stop and cannot be moved.
• Moveable pulley - a type of pulley which is free to move up and down, and its one end is attached to a ceiling or other object by two lengths of the same rope.
• compound pulley - combines a fixed (not moving) pulley with a movable pulley (attached to the load).
• Effort - supporting point of the lever
• load - is the weight being moved or lifted.
• fulcrum - is the force used to cause movement