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chap 5 matter
| Question | Answer |
|---|---|
| Motion- | an objects change in position over time when compared with a reference point |
| Speed | the rate at which an object moves |
| Average Speed Formula | average speed= total distance/total time |
| Velocity | the speed of an object in a particular direction |
| What can cause velocity to change ? (2 things) | |
| Acceleration – | the rate at which velocity changes |
| Acceleration is how fast what changes ? | the velocity |
| Acceleration Formula | |
| Positive Acceleration & Examples | speeds up (heart rate when running) |
| Negative Acceleration & Examples | slows down ( car when coming to a red light) |
| Centripetal Acceleration & Example | |
| Force | a push or a pull |
| Newton (N) – | Scientists express force using a unit called newtons |
| Net Force – | the force that results from combining all the forces exerted on an object |
| Why are unbalanced forces necessary to cause movement ? | The net force is not zero |
| Balanced Forces | forces on an object that cause a net force to be zero |
| Friction – | a force that opposes motion between two surfaces that are touching |
| Sources of Friction | microscopic hills and vallys of objects |
| Relationship between greater force & friction | |
| Sliding Friction | if u push an object and it goes a little ways then stops |
| Rolling Friction | example between wheels and the floor |
| Fluid Friction | opposes the motion of moving through a fluid |
| Ways to reduce friction – | lubricants |
| Ways to reduce friction – | sandpaper |
| Ways to increase friction | make surfaces rougher |
Created by:
hannahvocab
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