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P10 Force and Motion (Weight and Terminal Velocity (An objects mass is the…
P10 Force and Motion
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Forces and Elasticity
The extension of a spring is directly proportional to the force applied to it, as long as the limit of proportionality is not exceeded
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Beyond the limit of proportionality the extension of a spring is no longer proportional to the applied force
An object is called elastic if it returns to its original shape after removing the force deforming it
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Force and Acceleration
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The greater the resultant force on an object, the greater the object's acceleration
Forces and Braking
High speed, poor weather conditions and poor vehicle maintenance all increase the braking distance
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Momentum
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A closed system is a system in which the total momentum before an event is the same as the total momentum after the event
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Impact Forces
When 2 vehicles collide, they exert equal and opposite forces on each other and their total momentum is unchanged
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The longer the impact time, the more the force is reduced
When vehicles collide the force of the impact depends on mass, change of velocity and length of impact time
Safety First
Side impact bars and crumple zones give way in an impact, and so increase the impact time
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