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Cards In This Set
| Front | Back |
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What is the difference between speed and velocity?
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Speed is just how fast you are going, eg m/s or mph
Velocity must also have a direction specified eg 30m/s north, or 20mph 060degrees |
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What is the formula for speed?
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Distance over time
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What is the formula triangle for speed distance time?
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Distance over speed times time
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What is acceleration?
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How quickly the velocity is changing
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How is acceleration measured?
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In metres per second squared
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What is the formula triangle for acceleration?
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Change in velocity (triangle v) over acceleration times time
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How do speed cameras measure speed?
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They take two photos a fraction of a second apart, lines painted on the road show how far the car has travelled in the time between when the two photos were taken.
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D-T graphs - what does a straight sloping line upward mean? (time x axis, distance y axis)
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Steady speed
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D-T graphs - what does a straight horizontal line mean? (time x axis, distance y axis)
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Stopped
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D-T graphs - What does an upward curve mean?
(time x axis, distance y axis) |
Accelerating
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D-T graphs - What does a levelling off curve mean?
(time x axis, distance y axis) |
Decelerating
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D-T graphs - What does a downward sloping straight line mean?
(time x axis, distance y axis) |
Steady speed in the opposite direction
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V-T graphs - What does a straight upward sloping line mean?
(Time x axis, velocity y axis) |
Acceleration
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V-T graphs - what does a straight horizontal line mean?
(Time x axis, velocity y axis) |
Steady speed
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V-T graphs - what does an upward curve mean?
(Time x axis, velocity y axis) |
Changing acceleration
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