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ACT Science Glossary of Terms #3

Teacher: Mrs. S. Vandervort
Across
The model of the solar system that places the Earth at the center with the planets and the Sun orbiting around it
The distance from a focal point to a mirror or lens
A light wave that has an electric field component and a magnetic field component. It does not require a medium to travel through
A state at which the forward and reverse reaction proceed at the same rate
That which acts on an object to change its motion; a push or pull exerted on one object by another. Common units are Newtons
The energy due to an object's position within an electric field
The smallest entity that has distinct chemical properties. It can not be decomposed by ordinary chemical reactions.
The force that acts parallel to surfaces in contact opposite the direction of motion or tendency of motion
The apparent path of the Sun across the sky over the course of a year
A large mass of snow-covered ice
The study of rocks and minerals
Down
An organelle that is used to transport proteins throughout the cell
The force that exists between particles due to their charge. Particles of like charge repel, particles of unlike charge attract
An organelle that packages proteins so that they can be sent out of the cell
Smaller circles on which the planets traveled around the Earth in the geocentric model of the solar system. These were used to explain the retrograde motion of planets and help make the predicted positions of the planets match the observed positions
The ability to do work or undergo change. Kinetic energy is the energy of motion, while potential energy is stored energy
The number of cycles or repetitions per second. This is also often measured as the number of revolutions per second. The common units of this are Hertz where one Hertz equals 1/second
A group of atoms that give a molecule a certain characteristic or property
Contains all genetic material for an organism. The smallest units of DNA are called nucleotides.
An object in one-dimensional motion that is only acted on by the force of the Earth's gravity. In this case its acceleration will be -g or g downward.
A geometric shape that is formed when a plane is intersected with a cone. In this case the plane intersects the cone at an angle so that a shape similar to a circle but stretched in one direction is formed. The orbits of the planets around the Sun represents this.