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11 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What is the equation for force
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F=ma
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how do you calculate the resultant force
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Add all the forces in an object
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What does the resultant force have the same effect as
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it has the same effect as all individual effect acting upon that object, together
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What does it mean if the resultant force is zero
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The object is staying at the same speed
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What does it mean if the resultant force is not equal to zero
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The object is accelerating or decelerating, depending upon the direction of the resultant force
Speed up if its in the same direction as the object is moving Slow down if its in the opposite direction |
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What is the equation for calculating stopping distance
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stopping distance = thinking distance + braking distance
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What is thinking distance
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The amount of time it takes for the driver to react a situation and to take effect
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What can influence thinking distance
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Tiredness
Lack of concentration Under the influence of drugs Under the influence of alcohol The speed of the car |
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What is braking distance
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The distance taken to stop once the brakes are applied
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What increases braking distance
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Brakes and/or tyres are in poor condition
Poor road/weather conditions If the vehicles speed increases the braking distance increases |
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What relationship is there between braking distance and speed
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As the speed increases the braking distance is squared:
As braking doubles, speed increases 4 times |
This is because the kinetic energy of the car also has a squared relationship with speed
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