P2 Summary

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  • Forces and Energy
    • Moving objects reach a terminal velocity (op speed) when drag forces matches driving forces
    • Momentum is mass x velocity. It is conserved when objects collide or explode apart if no external forces act
    • A force transfers energy when it does some work on a n object
    • Objects gain gravitational potential energy if they are lifted up. Moving objects have kinetic energy. Stretched or squashed elastic objects store elastic energy
    • The stopping distance of a vehicle is thinking distance plus braking distance
    • A resultant force shows the combined effect of several forces. It makes an object accelerate (change speed or direction)
    • The speed of an object can be found using a distance time graph. The acceleration and distance traveled can be found using a velocity time graph.

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