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Published byJessica Davidson Modified over 3 years ago

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Linear Motion

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Lex I: Corpus omne perseverare in statu suo quiescendi vel movendi uniformiter in directum, nisi quatenus a viribus impressis cogitur statum illum mutare. Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it. Law of Inertia - Newtons First Law

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Some Definitions and Ideas Motion is relative – to something else! Speed – distance/time To go from my house to school takes me 30 minutes – it is 40 km What was my: –Average speed –Instantaneous speed

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To go from the Earth to the moon takes about 3 days by Apollo capsule – what was the average speed? (400,000 km) Do you think the average speed is meaningful in this example?

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Velocity Vector and scalars Constant Velocity Changing Velocity v

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The speedometer of a car moving northward reads 60km/hr. It passes another car that travels southward at 60km/hr. Do both cars have the same speed? Do both cars have the same velocity?

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Changing Velocity v aka – Acceleration Acceleration = Change in Velocity/time Something is accelerating when it changes its velocity!

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Free Fall – Wheeee! 0 Seconds0 m/s 1 second10 m/s 2 seconds20 m/s 3 seconds30 m/s Acceleration = Change in Velocity/time = 10m/s / 1s = 10m/s/s or 10m/s 2

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How Fast??? Instantaneous speed = acceleration x elapsed time v = gt Speed or Velocity = gravitational acceleration x time Gravitational acceleration on Earth is 9.8 m/s 2 Which we round to 10m/s 2 If a rock falls for 10 seconds, how fast is it going when it hits you???

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How Far??? Now you have to put the idea of average velocity together with time and acceleration. In the first second – how far did it fall? Velocity to start? 0 m/s Velocity at end of 1 second? 10 m/s Average Velocity = d=vt =>>>

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d = 1/2gt 2

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