Circular motion and Oscillations Flashcards Preview

A level Physics - OCR A (New spec.) > Circular motion and Oscillations > Flashcards

Flashcards in Circular motion and Oscillations Deck (11)
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1

Define Centripetal acceleration

Acceleration of any object travelling in a circular path at constant speed, always acts towards the centre of a circle

2

Define SHM

Oscillation motion for which a is directly proportional to x and is directed towards some fixed point- characterised by a=-(w^2)X

3

Define damping

Oscillations in which the kinetic energy is converted into other forms i.e. heat and so the amplitude of the
oscillation reduces.

4

Define free oscillations

When an object oscillates without a driving force acting to keep it oscillating. Objects undergoing free
oscillations vibrate at their natural frequency

5

Define Natural frequency

The frequency of the free oscillations of a system

6

Define forced oscillations

Oscillation in which a periodic driver force is applied to an oscillator

7

Driving Frequency

Frequency with which a periodic driver is applied to a system in forced oscillation

8

Define Resonance

When the driving frequency is equal to the natural frequency of an oscillating system. This causes a
dramatic increase in the amplitude of the oscillations.

9

How would you find F & V from whirling bung experiment? 5 marks

- Student tries to rotate bung at a constant radius

- Force F is calculated from F=mg, where m is mass of the slotted masses

- Measure time t for n revolutions of the bung

- Measure radius r when stationary

- Calculate v using 2PiR/t.

10

When would you use X=ACosWT?

When pendulum released from highest point and oscillations timed from that point.

11

Define Displacement

Distance (of the body) from equilibrium position.