Josh Drexler
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| Motion | when an object changes position over time when compared with a reference point.
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| Speed | The rate at which the object travels.
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| Average Speed Formula | Average speed equals total distance/total time
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| Velocity | The speed of an object in a particular direction
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| What can cause velocity to change ? (2 things) | Speed or direction
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| Acceleration | The rate at which the velocity changes.
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| Acceleration is how fast what changes ? | velocity
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| Acceleration Formula | acceleration equals final velocity – starting velocity/time it take to change velocity
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| Positive Acceleration & Examples | When the velocity is increased. A plane taking off
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| Negative Acceleration & Examples | When the velocity is decreased. A car stopping.
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| Centripetal Acceleration & Example | The acceleration that occurs in circular motion
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| Force | A push or pull.
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| Newton (N) | How scientists express force.
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| Net Force | The force that results from combining all the forces exerted on an object
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| Why are unbalanced forces necessary to cause movement ? | Because they make a change in motion.
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| Balanced Forces | when an objects net force is at 0
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| Friction | A force that opposes motion between two surfaces that are touching.
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| Sources of Friction | When the surface of any object is rough.
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| Relationship between greater force & friction | The amount of friction depends on the force pushing the surfaces together. The stronger the force the greater the friction
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| Sliding Friction | The force is large.
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| Rolling Friction | The force is smaller and easier to overcome.
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| Fluid Friction | The force is less than sliding friction.
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| Ways to reduce friction | lubricants
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| Ways to increase friction | sandpaper
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| Gravity | A force of attraction between objects that is due to their masses.
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| Why must force be used to lift objects? | Because all objects have gravity and you must do it to overcome the gravitational pull.
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| What does the Law of Universal Gravitation state? (3 parts) | Gravitational pull is small between objects with smaller masses. Gravitational force is larger between objects with larger masses. If the space between the 2 objects is increased then the gravitational force pulling them together is reduced.
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To hide a column, click on the column name.
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You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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