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PHYSICS

PHYSICS. s u v a t . v. v [ms -1 ]. u. gradient = a = v-u t. t. t [s]. v = u + at. 1. v. v [ms -1 ]. u. t. t [s]. v. v [ms -1 ]. u + v 2. u. t. t [s]. s = (u + v) x t 2. 2. 1.

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PHYSICS

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  1. PHYSICS

  2. s u v a t

  3. v v [ms-1] u gradient = a = v-u t t t [s] v = u + at 1

  4. v v [ms-1] u t t [s]

  5. v v [ms-1] u + v 2 u t t [s] s = (u + v)x t 2 2

  6. 1 Rearrange Eq to make ‘v’ the subject 2 Substitute ‘v’ into Eq giving ‘s’ in terms of ‘u’, ‘a’ and ‘t’ s = ut + ½at2

  7. 1 Rearrange Eq to make ‘t’ the subject 2 Substitute ‘t’ into Eq giving ‘s’ in terms of ‘u’, ‘a’ and ‘v’ Rearrange this to now make ‘v2’ the subject v2= u2 + 2as

  8. v v [ms-1] u Can you derive all these from this graph? t t [s] s = ut + ½at2 v = u + at s = (u + v)x t 2 v2= u2 + 2as

  9. Ticker timer • Frequency of 50Hz, therefore Time period of _____ s • Drop mass off bench, attached to tape • Measure distance between dots • Work out velocity • Record your results in a table • Plot a graph to calculate acceleration

  10. Velocity-time graph • A mountain biker accelerates uniformly down a ramp taking 10s to reach 20m/s. • They stay at 20m/s for the next 30s of the course. • They then take 5s to slow down to 10m/s as they enter the technical, steep part of the track. They stay at 10m/s for the next 20 seconds. • Breaking out of the woods they accelerate to 30m/s in 5s as they hit the high speed part of the course. They maintain 30m/s for the next 20s. • They cross the finish line and it takes them 5s to come to a stop. http://www.youtube.com/watch?v=LSqj8c8LaBQ&feature=related

  11. Group work Explain how experiments carried out by Galileo overturned Aristotle’s ideas of motion.

  12. Projectile Motion

  13. Objective • Use the suvat equations to calculate the motion of an object that is moving with horizontal and vertical components of velocity.

  14. What to do.... • Draw a diagram if possible. • List any assumptions made (e.g. air resistance negligible) • Split motion into its vertical and horizontal components. • Write down what you do know for s,u,v,a and t for each component (‘t’ often the same for both) • Solve equation, giving the answer to an appropriate number of significant figures. • Sit back and relax.

  15. A student, after impressing their friends with their drinking prowess, decides they may be feeling a bit queasy. After going outside to ‘get some air’ they feel a bit better. Then, while standing upright and facing forwards, the drink returns. If the cider/WKD/Stella initially leaves at 5 ms-1 horizontally.... • What assumptions and estimations will you make? • How long does it take to hit the ground? • How far does it go? • What is the velocity when it hits the ground (size and direction)? • When do they next decide to drink alcohol again?

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