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motion vg
| Question | Answer |
|---|---|
| Ch 5 Matter in Motion Terms | |
| Motion | when an object changes position over time when compared with a reference piont |
| Speed | the rate at which the object moves |
| Average Speed Formula | total distance divided by total time |
| Velocity | the speed of an object in a particular direction |
| What can cause velocity to change? (2 things) | speed and direction changes |
| Acceleration | is the rate at which velocity changes |
| Acceleration is how fast what changes? | Velocity |
| Acceleration Formula | final velocity-starting velocity divided by time it takes to change velocity |
| Positive Acceleration & Examples | acceleration in which velocity increases is sometimes called positive acceleration. Ex is riding a bike |
| Negative Acceleration & Examples | acceleration in which velocity decreases is sometimes called negative acceleration. Ex is car stopping at a red light |
| Centripetal Acceleration & Example | the acceleration that occurs in circular motion is known as centripetal acceleration. Ex like the blades spinning on a windmill |
| Force | is a push or pull |
| Newton (N | scientist express force using a unit |
| Net Force | is the force that results from combining all the forces exerted on an object. |
| Why are unbalanced forces necessary to cause movement? | when the net force on an object is not zero, the forces on the object are unbalanced. Unbalanced forces produce a change in motion (acceleration) |
| Balanced Forces | when the forces applied to an object produce a net force of zero, the forces are balanced |
| Friction | is a force that opposes motion between two surfaces that are touching |
| Sources of Friction | rougher surfaces create more friction, greater force creates more friction |
| Relationship between greater force & friction | the amount of friction also depends on the force pushing the surfaces together |
| Sliding Friction | sliding friction is very effective at opposing the movement of objects and is the force that causes the eraser to stop moving. |
| Rolling Friction | |
| Fluid Friction | |
| Ways to reduce friction – lubricants | |
| Ways to reduce friction – sandpaper | |
| Ways to increase friction | |
| Section 4 | |
| Gravity | |
| Why must force be used to lift objects? | |
| What does the Law of Universal Gravitation state? (3 parts) |
Created by:
vincent1111
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