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A LEVEL PHYSICS Year 1

A LEVEL PHYSICS Year 1. I can describe how the velocity of an object in free fall changes as it falls (grade d) I can mathematically show that two objects of different mass fall at the same rate (grade c) I can use SUVAT equations to calculate the parameters of falling objects (grade b). A*.

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A LEVEL PHYSICS Year 1

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  1. A LEVEL PHYSICSYear 1 • I can describe how the velocity of an object in free fall changes as it falls (grade d) • I can mathematically show that two objects of different mass fall at the same rate (grade c) • I can use SUVAT equations to calculate the parameters of falling objects (grade b) A* Free fall and SUVAT A B C

  2. Galileo Galilei When dropped from the same height which object hits the ground first?

  3. Falling Objects • Any two objects accelerate at the same rate due to the force of gravity • Constant Gravitational force = constant acceleration • Mass has no effect • Surface area increases drag (air resistance)

  4. Freefalling • Plot a graph of s against t2: • Considering s=ut + 1/2at2 calculate the acceleration due to gravity. (Hint: compare it to y=mx+c)

  5. Proving it mathematically • Use the equation below to prove that two objects will hit the earth at the same point: s = ut + ½ at2

  6. Quick Questions • A pebble released from rest on a bridge hit the water below 0.9s later. Calculate the distance it fell and its speed upon hitting the water. • A spanner was dropped from a hot air balloon when the balloon was at rest 50m above the ground. Calculate the time take and the velocity. • A bungee jumper jumped off a platform 75m above a lake. Releasing a small object the instant she left the platform. • Calculate the time taken by the object to fall and the speed (assume air resistance is negligible). • Describe how long the bungee jumper would take to descend relative to the object. Explain why. • An astronaut on the moon threw an object 4.0m vertically upwards and caught it 4.5 seconds later. • Calculate g on the moon and the speed of projection of the object. • How high would the object have risen on earth from the same projection?

  7. Quick Answers • 4.0m, 8.8m/s • 3.2s, 31m/s • 3.9s, 38m/s • 1.6m/s, 3.6m/s, 0.64m

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