Newton's Laws of Motion
The property of things to resist changes in motion.
Inertia
The property of a system that enables it to do work.
Energy
The number of rotations or revolution per unit of time.
Electron
The net upward force that a fluid exerts on an immersed object.
Buoyant Force or Buoyancy
In the simplest sense, a push or a pull.
Force
Potential Energy
The average position of weight in an object.
A pure substance consisting of only 1 kind of atom.
Element
The ratio of force to the area over which that force is applied.
Pressure
The force due to gravity on an object.
Weight
Energy of motion.
Kinetic Energy
A force directed toward a fixed point, usually the cause of circular motion.
Unseen and unidentified matter that is evident by its gravitational pull on stars in the galaxies.
Dark Matter
The tendency of the surface of a liquid to contract in area and thus to behave like a stretched elastic membrane.
Surface Tension
The speed at a given instant.
Instantaneous Speed
Energy can be neither created nor destroyed.
Conservation of Energy
A projectile or small celestial body that orbits a larger celestial body.
Satellite
The mass of a substance per unit of volume.
Density
The pressure exerted against bodies immersed in the atmosphere.
Atmospheric Pressure
Motion under the influence of gravity only.
Free fall
A device, such as a lever or pulley, that increases (or decreases) a force or simply changes the direction of the force.
Machine
The technical word for the oval shaped path travelled by a satellite.
Ellipse
A "complementary" form of matter composed of atoms with negative nuclei and positrons instead of electrons.
Antimatter
An electrified gas containing ions and free electrons.
Plasma