force - a push or pull on an object, balanced forces - equal forces acting on one object in opposite directions, causing no motion, evaporation - the change of a substance from a liquid to a gas, condensation - the change of a substance from a gas to a liquid, unbalanced forces - forces acting on one object in opposite directions, causing motion, friction - a force that opposes motion between two surfaces that are touching, causing heat, gravity - an invisible force that pulls objects toward each other, air resistance - friction caused by an object moving through gases, mass - the amount of matter in an object, weight - the force of gravity on an object, matter - anything that takes up space and has mass, physical change - a change in a substance that does not involve a change in the identity of the substance and can usually be reversed, chemical change - a change that occurs when one or more substances change into entirely new substances with different properties, solid - a form of matter that has a definite shape and volume, liquid - a state of matter that has no definite shape but has a definite volume and takes the shape of its container, gas - a state of matter with no definite shape or volume, conduction - the direct transfer of heat from one substance to another substance that it is touching, convection - the transfer of thermal energy by the circulation or movement of a liquid or gas, radiation - the transfer of thermal energy as electromagnetic waves, water vapor - water in the form of a gas,

Physical Science Vocabulary

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