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A2 Physics 6.1 Periodic motion
Transcript of A2 Physics 6.1 Periodic motion
Lesson 1: Circular Motion and A2 Introduction
Why is it possible to swing a bucket of water over your head without getting wet?
Motion in a circular path at constant speed implies there is
an acceleration and requires a centripetal force.
Sketch the bucket and string scenario.
On the bucket draw the forces acting on it.
What direction is the resultant force?
What direction is the acceleration?
What other examples are there of circular motion?
We need to use a different measurement for measuring angles when describing circular motion:
One radian is the angle subtended at the centre of a circle by an arc of length equal to the radius of the circle
Angle in radians = arc length / radius
What is the angle in radians for one complete revolution (Hint circumference = 2πr
1) In your own words define radians
2) An angle subtends an arc length of twice the radius. What is the angle in radians?
3) An angle subtends half a circle what is the angle in radians?
Ext: Write an equation to convert radians to degrees.
For a complete circle (360 degrees) the arc length is the circumference of the circle (2πr).
Dividing this by the radius (r) gives 2π . So there are 2π radians in a complete circle
Using the fact that 360 degrees = 2π radians
Derive the number of radians for
1) 45 degrees
2) 90 degrees
3) 190 degrees
Why might radians be a better unit than degrees?
Derive the number of degrees for
1) 3π radians
2) 4 radians
3) 0.5π radians
Lesson 3: Damping Experiment
What is damping?
Read the information about the skyscraper Taipei 101.
Describe what you think damping is with reference to energy
How is Taipei 101 designed for damping?
Hypothesis: As the surface area of a pendulum increases the damping force due to air resistance increases.
Aim: To investigate this hypothesis
Task 1: In groups of 3 discuss how this hypothesis could be investigated in the lab
Task 2: Write a requisition for equipment needed
Task 3: Draw a table to record your results
A possible source of systemic error
The absolute uncertainty of your instruments
The percentage uncertainty of your results
The total percentage uncertainty of your results
Send 1 person to another group, ambassadors explain your method and compare to other groups.
Make notes on damping using the printout
Copy the graph and distinguish between light damping, heavy damping and critical damping
What is physics like?
2B's in GCSE Science
Example topic: Resonance A2
What is resonance?
What was driving the oscillation?
Why was this a problem?
What was the solution?
Resonance is when the amplitude of an oscillation increases exponentially.
All objects which can oscillate have a natural frequency of vibration. This is independent of amplitude.
Natural frequency is the frequency at which a system tends to oscillate in the absence of any driving or damping force
1) Describe three situations where resonance occurs
2) Anticipate one method of controlling resonance
Ext: Does resonance show the conservation of energy being refuted?
Year 12 advice from this year
1) A lot of the GCSE is irrelevant
2) You cannot revise at the last minute, start immediately
3) Keep your folder organised
4) The specification is very new
5) Practicals have to be taken seriously now
6) You will find it difficult without AS maths (A2 will be nearly impossible)
7) Pace is fast
8) Stay on top of homework!
Exams and scheme of work: