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Forces Level 2
All the vocabulary for Level 2 of the Forces menu
| Question | Answer |
|---|---|
| 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
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