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Science Final

Vocabulary Terms

Force A push or pull exerted on an object
Friction Force that two surfaces exert on each other when they rub against each other
Weight A measure of the force of gravity acting on an object
Speed The distance an object travels per unit of time
Velocity Speed in a given direction
Acceleration Then rate at which velocity changes
Sliding Friction Friction that occurs when one solid surface slides over another
Rolling Friction Friction that occurs when an object rolls over a surface
Static Friction Friction that acts between objects that are not moving
Fluid Friction Friction that occurs as an object moves through a fluid
Work work=force * distance in Joules
Power power= work/time in Watts
Gravitational Potential Energy Energy an object possesses because of its position in a gravitational field; 9.8
Energy The ability to do work or cause change
Kinetic Energy Energy that an object has due to its motion
Altitude Elevation above sea level
Weather The condition of Earth's atmosphere at a particular time and place
Atmosphere The relatively thin layer of gases that form Earth's outermost layer
Water Vapor Water in the form of a gas
Electromagnetic Radiation The energy transferred through space by electromagnetic waves
UV Rays Electromagnetic waves with wavelengths that are shorter than visible light
Infrared Radiation Electromagnetic waves that are longer than visible light but shorter than microwaves
Greenhouse Effect The trapping of heat near a planet's surface by certain gasses in th eplanet's atmosphere
Scattering Reflection of light in all directions
Optical Telescope A telescope that uses lenses and mirrors to collect and focus visible light
Nonoptical Telescope A telescope that doesn't collect visible light
Parallax The apparent change in position of an object when seen from different places
Lightyear The distance that light travels in one year, about 9.5 million million kilometers
Penumbra The part of the shadow surrounding the darkest part
Umbra The darkest part of a shadow
Created by: rachelle.hayek