Vocabulary #11

star: a large, hot ball of gases, which  is held together be gravity and gives off its own light.

parallax: the apparent shift in an object's location when viewed from towo position.

light-year: the distance light travels in a year.

contellation: a number of stars that appears to from a pattern.

magnitude: the brightness os a star.

nebula: a cloud of gas and dut in space.

supernova: a start that explodes.

black hole: an object whose gravity is so strong that light cannot escape it.

Vocabulary #9 & #10

Planet: a large body orbiting a star, such as the sun.

solar system: a star, such as the Sun, and all the objects orbiting it.

asteroid: a rocky, metallic object that orbits the sun.

Kepler's laws: laws that summarize the movement of the planets.

comet: a ball of rock and ice that orbits the sun.

meteoroid: a small asteroid (rock object that orbits the Sun) which may be far out in the solar system or close to the inner planet.

meteor: a meteorid that enters Earth's atmosphere and burns whit a streak of ligth.

meteorite: any part of a meteorid that reaches Earth's surface.

Vocabulary #8

phase of the moon: the sahpe if the lighted part of the moon seen fron Earth at any time.

lunar eclipse: a blocking of a view of the full Moon when the Moon passes into Eart's shadow.

solar eclipse: a blocking out of a view of the Sun when Earth passes through the moon's shadow.

tide: the regular rise and fall of the water level  along a shoreline.

Vocabulary #7

rotation:  a complete spin on an axis.

International Date Line:  the 180° line of  longitude.

stanadard time zone:  a belt 15° wide in longitude in which all places hace the same time.

revolution:  one complete trip arond the sun.

Vocabulary #6

universe: everything that exist.

telescope: a device that collects light and makes distan objects appear closer and lager.

refraction: the bending of wave as they go from one substace to another.

reflection: the boucing of waves off a surface.

wavelength: the distance from one peak to the next on a wave.

frequency: the number of waves that pass through a point in a second.

electromagnetic spectrum: waves of light in order be wavelength.

Vocabulary #5

Inclined plane: a straight,slanted surface that is not moved when it is used.

Screw: an inclined plane wrapped around a central bar.

wedge: one or a combination of teo inclined planes that is moved when used.

compound machine: a combination of two or more machines.

efficiency: a ratio of the work done by a machine compared with the work put into the machine.

Vocabulary #3 & #4

Potential Energy:the Energy Stored in an Object or Material.

Gravitational Potential Energy:The Potential Energy of an Object located above the ground.

Kinetic Energy:The Energy of a moving object.

Work:Force Applied to an Object times the distance the object moves.

Simple Machine:A Device with few parts that makes it easier to do work

Effort Force:The Force Applied to a machine.

Resistance Force:The Force that make machine actis against.

Lever:A Simple Machine made of a ridgid bar on a pivot point.

Fulcrum:A Pivot Point of a Lever

Mechanical Advantage:The Number of times a machine multiplies the force applied.

Pulley:A Grooved wheel that turns by the action of a rope in the groove.

Wheel And Axle:A Simple Machine Made of a handle or axis attached to the center of a wheel

Vocabulary #1 & #2

Force:A Push or pull exerted by one object on another.

Friction:A Force that Oppoes the motion of an object in contact with a surface.

Drag-Force:A Force that oppoes the motion of an object throughta liquid or gas.

Gravity:A Force of Attraction that exists between all object with mass.

Net-Force:The Combined effect of all the forces acting on an object.

Balanced-Forces:Forces that cancel each other out when acting together on a single object.

Unbalanced-Forces:Forces that do not cancel each other out when acting together on a single object.

Inertia:The Tendecy of an object to oppoes a change in motion.

Momentum:The Mass of an object Multiplied by its velocity