ch. 5 jonathan pak Word Scramble
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| Question | Answer |
| Ch 5 Matter in Motion Terms | |
| Motion | When an object changes position over time when compared with a reference point |
| Speed | rate at which an object moves |
| Average Speed Formula | total distance/total time |
| Velocity | speed of an object in a particular direction |
| What can cause velocity to change? (2 things) | positive acceleration and negative acceleration |
| Acceleration | rate at which velocity changes |
| Acceleration is how fast what changes? | velocity |
| Acceleration Formula | final velocity-starting velocity/time it takes to change velocity |
| Positive Acceleration & Examples | plane taking off, driving down a hill |
| Negative Acceleration & Examples | car stopping at a stop sign, bicycle slowing down |
| Centripetal Acceleration & Example | jogging on a winding trail, driving around a corner, standing at Earth’s equator |
| Force | push or pull |
| Newton (N) | unit that scientists use to express force |
| Net Force | the force that results from combining all the forces exerted on an object |
| Why are unbalanced forces necessary to cause movement? | |
| Balanced Forces | |
| Friction | force that opposes motion between two surfaces that are touching |
| Sources of Friction | |
| Relationship between greater force & friction | |
| Sliding Friction | |
| Rolling Friction | |
| Fluid Friction | |
| Ways to reduce friction | lubricants |
| Ways to reduce friction | sandpaper |
| Ways to increase friction | make surfaces rougher |
| Section 4 | |
| Gravity | force of attraction between objects that is due to their masses |
| Why must force be used to lift objects? | |
| What does the Law of Universal Gravitation state? (3 parts) |
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