Horizontal Motion Eqns

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Presentation transcript:

Horizontal Motion Eqns

Average Velocity Revisited… And… by definition of average

So…

Displacement depends on acceleration, initial velocity, and time… Displacement = ½ * (initial vel. + final vel.)*(time)

Remember…

With uniform acceleration… And since

In summary Not derived…

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Suppose you want to design an air-bag system that can protect the driver in a head-on collision at a speed of 28m/s (approximately 60mph). Calculate how fast the air bag must inflate to effectively protect the driver. Assume the car crumples upon impact over a distance of about 1m.