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lesson 1-5
| Question | Answer |
|---|---|
| force | A push or pull exerted on an object |
| newton | A unit of measure that equals the force required to accelerate 1 kilogram of mass at 1 kilogram of mass at 1 meter per second per second |
| net force | The overall force on an object when all the individual forces acting on it are added together. |
| friction | The force that two surfaces exert on each other when they rub against each other. |
| sliding friction | Friction that occurs when one solid surface slides over another. |
| static friction | Friction that acts between objects that are not moving. |
| fluid friction | Friction that occurs as object moves through a fluid. |
| rolling friction | Friction that occurs when an object rolls over a surface. |
| gravity | The attraction force between objects; the force that moves objects downhill. |
| mass | The amount of matter I an object. |
| weight | A measure of the force of gravity acting on an object. |
| inertia | The tendency of an object to resist a change in motion. |
| momentum | The product of an object's mass and velocity. |
| law of conservation of momentum | The rule that in the absence of outside forces the total momentum of objects that interact does not change. |
| free fall | the emotion of a falling object when the only force acting on it is gravity. |
| statellite | any object that orbits around another object in space. |
| centripetal force | A force that causes an object to move in a circle. |