Can you Sky-dive? This is a classic GCSE question which gets you loads of lovely points What do points mean? POINTS MEAN PASSES!

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Presentation transcript:

Can you Sky-dive? This is a classic GCSE question which gets you loads of lovely points What do points mean? POINTS MEAN PASSES!

Just after Jumping Out The skydiver is moving slowly at first Air Resistance is small The Weight is bigger than the Air Resistance She ACCELERATES Air Resistance Weight of skydiver

After a few seconds... The skydiver is moving faster now Air Resistance is bigger The Weight is still bigger than the Air Resistance She still ACCELERATES but at a smaller rate Air Resistance Weight of skydiver

After falling some time... The skydiver is moving very fast now, about 60m/s Air Resistance is as big as the weight, but upwards. The Weight and Air Resistance BALANCE OUT She travels at a CONSTANT SPEED Air Resistance Weight of skydiver

Terminal Velocity(top speed) Remember she travels at her TERMINAL VELOCITY when the Weight and Air Resistance BALANCE OUT and so she does not accelerate but continues down at a CONSTANT SPEED Air Resistance Weight of skydiver

She pulls the ripcord! She is still GOING DOWN at about 60m/s and so the Air Resistance from the parachute’s big AREA is ENORMOUS! Air Resistance is bigger than her Weight so she DECELERATES Still the same Weight REALLY BIG Air Resistance

She slows down, decelerates She is still GOING DOWN, but much slower. Air Resistance is less at the slower speed Air Resistance is still bigger than her Weight so she still DECELERATES but at a lower rate Still the same Weight Slower speed so less Air Resistance

Eventually... She is still GOING DOWN, but quite slowly, about 12 m/s. Air Resistance is now equal to her Weight again Since Air Resistance now BALANCES OUT her Weight she does not accelerate she continues at a CONSTANT SPEED Still the same Weight Slower speed so less Air Resistance

Summary Weight bigger than Air Resistance. She ACCELERATES Faster speed means BIGGER Air Resistance When Weight and Air Resistance BALANCE OUT then she goes at constant speed or her TERMINAL VELOCITY!