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26 Cards in this Set
- Front
- Back
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Crest |
Highest point of a wave |
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Trough |
The lowest point of a wave |
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Wavelength |
The distance from one crest to another or one trough to another |
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Amptitude |
The distance from the middle of the wave to the crest or the trough . this shows the amount of energy the wave carries |
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Frequency |
How many waves that pass through a point in a second. |
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Hertz |
The unit used to measure frequency . One wave per second equals one hertz |
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How to find frequency |
Speed÷ wavelength |
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How to find wavelength |
Speed÷ frequency |
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How to find speed |
Walength × frequency |
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Transverse waves |
These are waves where the disturbance moves perpendicular to the direction of the wave |
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An eg. Of transverse waves |
Water wave- where the water moves up and down as the wave passes through the ocean |
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What are longitudinal waves |
Waves where the disturbance moves in the same direction as the wave |
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Eg. Of longitudinal waves |
Wave moving through a stretched out slinky or spring. If you compress one portion of the slinky and let go, the wave will move left to right. At the same time, the disturbance ( which is the coils of the springs moving) will also move left to right |
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A wave's ______ depends on the kind of wave and the _________material it travels through |
Speed , type of material |
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Light waves travel faster through aire than sound waves do. An example of this is? |
Even though lighting and thunder are created at the same time, you see lightning first. |
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What is the formula for finding the gradient? |
Gradient (m) = rise/ run = change in Y/change in X= y2-y1/x2-x1 |
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What is a physical quantity? |
Anything that can be measured |
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What is a basic quantity? |
Is a set of units for physical quantities from which every other unit can be generated generated 🔬 |
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What is precision |
Degree to which several measurements provide answers very close to each other |
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What is accuracy? |
Is how close a value is to the actual value |
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Give 5 measuring instruments |
1. Spring balance 2. Laboratory thermometer 3. Meter rule 4. Stop watch 5. Ammater (measures electric current) |
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Why are these instruments important? |
1. It allows us to make observations objectively 2. It allows us to observe quantitively 3. Allows us to measure very small changes which we normally can't detect. |
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Four careers that require the knowledge of physics |
1. Air traffic controller 2. Agricultural engineers 3. Marine engineer 4. Biophysics |
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Examples of five basic quantities |
1. Length 2. Mass 3. Time 4. Temperature 5. Electric current |
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Examples of 5 derived quantities ( and their units) |
Area- square meter m² Volume - cubic meter m³ density - kilogram per cubic kg m-³ Acceleration - meter per second ms -¹ Momentum - meter per second squared ms-² |
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What is the gradient of a straight line? |
Is the rate at which the line rises ( or falls) vertically for every unit across to the right |
