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Science-2-1
Chapter 2-Lesson 1
| Question | Answer |
|---|---|
| force | a push or a pull on an object (N) |
| contact force | a push or a pull on one object by another that is touching it |
| noncontact force | a force that one object can apply to another object without touching it |
| gravity | an attractive force that exists between all objects that have mass |
| mass | the amount of matter in an object (kg) |
| The Law of Universal Gravitation | states that all objects are attracted to each other by a gravitational force |
| gravitational force and mass | when an objects mass increases, the gravitational force between them increases |
| gravitational force and distance | when the distance between objects increases, the attraction decreases |
| weight | the gravitational force exerted on an object (N) |
| weight and mass | weight is proportional to mass |
| weight and mass (larger distance) | has to be much farther away for the gravitational force to change |
| friction | a force that resists the motion of two surfaces that are touching |
| static friction | prevents surfaces from sliding past each other |
| sliding friction | opposes the motion of surfaces sliding past each other |
| fluid friction | friction between a surface and a fluid |
| air resistance | fluid friction between a surface and air |
| What causes friction between surfaces? | microscopic dips and bumps, microscopic roughness small particles (atoms/molecules) that make up all surfaces that cause a weak electrical charge |
| reducing friction | lubricant |
Created by:
2016stamerh
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