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# Forces Level 2

### All the vocabulary for Level 2 of the Forces menu

lubricant a substance that decreases friction between objects, such as oil, wax, or grease.
sliding friction a larger amount of friction than rolling friction
rolling friction a smaller amount of friction than sliding friction
buoyancy of gases a smaller amount of buoyancy than liquids
buoyancy of liquids a larger amount of buoyancy than gases
repel/repulsion to push apart (N to N or S to S on magnets, + to + or – to – in electricity)
attract/attraction to pull together (N to S on magnets, + to – in electricity)
steep incline an incline that requires more force to move an object up it than a shallow incline
shallow incline an incline that requires less force to move an object up it than a steep incline
constant acceleration on a VELOCITY vs. TIME graph, this is shown as a straight diagonal line with an upward slope.
decreasing acceleration on a VELOCITY vs. TIME graph this is shown by a "downward" curve that is flattening out.
increasing acceleration on a VELOCITY vs. TIME graph this is shown by an "upward" curve that is going towards vertical.
incline a ramp or slope
force A push or a pull. You must know these forces: gravity, magnetism, electric force, buoyancy, friction, atomic force.
gravity A force that accelerates all objects equally. (So a basketball and a golf ball fall at the same rate.) *** Gravity is greater for objects with larger mass, and objects that are closer together. Gravity decreases with less mass and far distances.
mass Mass is the amount of matter (atoms) in an object. Mass can only change if you remove or add matter.
weight Weight is how much gravity pulls an object downward onto a scale.
mass vs. weight If you travel from one planet to another, your mass does not change, but your weight changes, depending on the gravity of the planet.
projectile motion A projectile is a object that is propelled, like a cannonball from a cannon. A projectile falls toward the Earth at the same rate as a dropped object – if it’s the same object from the same height.
Created by: rhk9