7th Grade Science
Welcome to 7th Grade Science!
Vocabulary 7
Battery: a source of stored chemical energy.
Complete Circuit: a circuit with all the necessary connections for electricity to flow.
Component: one item in a circuit.
Contact Point: the place on a component where connections are made to allow electricity to flow.
Electric Current: the flow of electricity through a conductor.
Insulator: a material that prevents the flow of electricity, commonly plastic, rubber, glass, or air.
Vocabulary 6
Attract: to pull toward each other
Compass: an instrument that uses a free-rotating magnetic needle to show direction
Magnet: an object that responds to magnetic force
Magnetism: a property of certain kinds of materials that causes them to attract iron or steel
Pole: the end of a magnet
Potential Energy: energy that matter has because of its position
Repel: to push away from each other
Vocabulary 5
Energy: the ability to apply force over a distance
Force: a push or a pull
Friction: a force acting between surfaces in contact
Interaction: to act on and to be acted upon by one or more objects
Net Force: the sum of all forces acting on a mass
Newton: the standard unit for measuring force in the metric system
Vocabulary 4
Analog: smooth and continuous data
Binary: a number system which uses only two symbols (0 and 1)
Demodulation: the process of decoding the information transmitted by a modulated carrier wave
Digital: data expressed as single digits, usually 0 and 1
Modulation: the process of changing the amplitude or frequency of a carrier wave to transmit information
Optical fiber: a specially designed transparent fiber that transmits light over long distances by total internal reflection
Pixel: one element of a digital picture
Resolution: the clarity of detail in an image
Vocabulary 3
Color: how different wavelengths of light are perceived
Electromagnetic Spectrum: the range of all different electromagnetic wavelengths, including visible light, that can be seen as different colors and other wavelengths that cannot be seen by the human eye
Filter: a transparent material that can absorb certain colors
Interface: the place where two different media meet
Laser: a tool that produces a very narrow, focused beam of coherent light
Ray: a straight line that light waves travel in
Refraction: the changing of a wave’s speed and direction as it travels into a medium
Spectroscope: a tool that can separate light into its different wavelengths of electromagnetic radiation
Vocabulary 2
Absorb: to take in or soak up
Brainstorm: a process in which people freely makeup creative ideas
Constraint: a factor that limits what can be done
Criterion: a requirement that must be met
Decibel: a unit used to measure the amplitude of sound
Energy: usable power that can be transferred or converted to different forms but cannot be created or destroyed
Medium: a substance or material
Prototype: a physical or digital model of a design
Vocabulary 1
- amplitude: the height of the peaks above the resting line in a wave
- compression wave: a wave in which the wave’s medium is compressed in the same direction as the movement of the wave
- crest: the highpoint of a wave
- kinetic energy: the energy of motion
- node: a point where a wave crosses its resting line
- reflection: the bouncing back of waves off an object
- Transverse wave: a wave in which the movement of the of the wave’s medium is perpendicular to the movement of the wave traveling through the medium.
- trough: the low point of a wave