Flashcards in SHM revision Deck (38)

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1

## What is the period of oscillation?

### The time for one complete cycle of oscillation.

2

## If a trolley is at equilibrium attached to two springs, when pushed in one direction, what will the trolley do and why?

###
It will accelerate toward the equilibrium point.

The extended spring provides a restoring force.

3

## What is natural frequency?

### The frequency of free oscillations of an oscillating system.

4

## What are forced vibrations?

### Making an object oscillate at a frequency that is not it’s natural frequency

5

## When does resonance occur?

### When the driving force or oscillation matches the natural frequency of the system.

6

## What is the outcome of resonance?

### An increase in amplitude of the system’s oscillation.

7

## What is damping?

### The term used to describe the removal of energy from an oscillating system.

8

## What are the four levels of damping?

###
Light

Heavy

Critical

over damped

9

## Describe light damping of a system

###
The system oscillates over a long time frame before coming to rest.

The amplitude of the oscillations follow an exponential decay envelope.

10

## Describe over damped

###
The oscillating system returns to zero over an extended time frame.

(No discernible oscillation)

11

## Describe critical damping

###
The oscillating system returns to the zero position of the oscillation after one quarter of a time period.

Does not affect frequency.

12

## Define a free oscillator

### Oscillations where there is no periodic force acting on the system

13

## Define a forced oscillator

### A system is forced to oscillate by an external periodic force

14

## For an object undergoing SHM where does it have the greatest velocity?

### At the equilibrium position

15

## For an object undergoing SHM where does it have zero velocity?

### At the amplitudes

16

## For an object undergoing SHM where does it have the greatest acceleration?

### At the amplitudes

17

## For an object undergoing SHM where does it have the least acceleration?

### At the equilibrium point

18

## State the two conditions required for SHM

###
1. Acceleration always directed towards the equilibrium position

2. The acceleration is proportional to the displacement of the object from the equilibrium position

19

## What is the relationship between displacement and frequency for a shm oscillator?

###
They are independent.

As displacement increases the accelerations increases. this increases the average velocity which cancels out the additional distance the oscillator needs to travel

20

## What is the relationship between mass and frequency for a shm oscillator?

###
As mass increases the accelerations decreases (F=ma)

the lower acceleration causes a lower average velocity. This means time period will increase and from f = 1/T then frequency will decrease

21

## What is the relationship between spring constant and frequency for a shm oscillator?

### As spring constant increases the resting force increases (F=ke). This causes a larger acceleration (F = ma) which means the average velocity will be greater. The will reduced the time period and increase the frequency (f = 1/T)

22

## Describe the displacement against time graph for an oscillator starting at the right hand side amplitude

### Sin (x)

23

## Describe the velocity against time graph for an oscillator starting at the right hand side amplitude

### cos (x)

24

## Describe the acceleration against time graph for an oscillator starting at the right hand side amplitude

### -sin (X)

25

## What function should your calculator be in when using the displacement equation

### Radians

26

## Describe the acceleration against displacement graph for a SHM oscillator

### A straight line through the origin with a negative gradient

27

## Describe the velocity against displacement graph for a SHM oscillator

### A circle with the origin as the mid point

28

## Describe the kinetic energy against displacement graph for a SHM oscillator

### a n shape

29

## Describe the potential energy against displacement graph for a SHM oscillator

### a u shape

30