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POTH 225: BIOMECHANICS > lab 5: force plate > Flashcards

lab 5: force plate Flashcards

1
Q

what does force plate measure

A

measures the forces exerted by the body

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2
Q

in gait/balance activities, what are force plates used to measure (2)

A

1) GRF
2) centre of pressure

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3
Q

what is newtons 3rd law

A

for every force, there is a reaction force that is equal in magnitude and opposite direciton

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4
Q

GRF acting in contrast to your body pushing on the floor is an example of what law of newtons

A

newton’s 3rd law

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5
Q

where and during what activities does ground reaction force act

A

act on the foot during walking, jumping, running

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6
Q

what are the 3 components of ground reaction force

A

has 3 components
(vertical, med/lat, ant/post)

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7
Q

why does ground reaction force increase from 0-10% of stance

A

you are double support (so it will never be over 100) but it is increasing because you are adding weight (body weight shifting onto the leg)

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8
Q

be able to explain the 2 peaks and 1 valley in the ground reaction force

A

.

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9
Q

the first peak of vertical ground reaction force is during what part of phase

A

loading response/midstance

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10
Q

the second peak of vertical ground reaction force is during what part of phase

A

preswing/pushoff

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11
Q

what are the ground reaction force measures

A

peak (max ground reaction force)
loading rate = peak/time (it takes to get to peak)
pattern recognition (principal component analysis0

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12
Q

what is loading rate of GRF

A

peak/time (that it takes to get to the peak)

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13
Q

what is an example of pattern recognition in terms of ground reaction force measures

A

principal component anaylsis

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14
Q

what is cop (centre or pressure)

A

single point which a single force is considered to act through
=point where GRF is considered to act on the foot

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15
Q

where is the point where GRF is considered to act on the foot

A

the centre of pressure

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16
Q

what are the 3 components pf the force plate

A

top plate
bottom plate
sensors in between the plates

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17
Q

what is another name for common force plate sensors

A

transducers

18
Q

what are the 2 common sensors of force paltes

A

piezoelectric
strain gauge

19
Q

explain piezoelectric sensors

A

consists of a crystal when pressure is applies, there is a change in electrical current

20
Q

which sensor type does this apply to: consists of a crystal when pressure is applies, there is a change in electrical current

A

piezoelectric

21
Q

explain strain gauge sensors

A

metal plate/beam is deformed, changes electrical resistance

22
Q

which sensor type does this apply to: metal plate/beam is deformed, changes electrical resistance

A

strain gauge

23
Q

during force plate sensors, the changes in electricity are calibrated to what

A

the known forces at the manufacturer

24
Q

what is the wii fit

A

cheap force plate with 4 strain gauges

25
Q

what can the WII fit measure (2)

A

1) vertical GRF (not other direction)
2) COP

26
Q

force plates provide an analog or digital signal

A

analog

27
Q

true or false: force plates provide a digital signal

A

false, analog

28
Q

when is analog converted to a digital signal in force plates

A

analog is converted to digital signal prior to computer storage

29
Q

analog is a continuous waveform or discrete packets of data

A

continuous waveform

30
Q

digital is a continuous waveform or discrete packets of data

A

discrete packets of data

31
Q

does radio use analog or digital

A

analog

32
Q

be able to see the difference in graphs for analog vs digital

A
33
Q

continuous signal is associated with analog or digital

A

analog

34
Q

discrete packages are associated with analog or digital

A

digital

35
Q

what is the sampling frequency (rate) when converting analog to digital

A

how often you convert the analog signal the digital signal

=number of samples you take per second (Hz=samples/second)

36
Q

what is the formula for sampling frequency (rate)

A

=number of samples you take per second (Hz= samples/second)

37
Q

sampling frequency should be x2 the maximum frequency within the analog system according to what theroem

A

Nyguist

38
Q

Nyquist theoem states that sampling frequency should be x2 what

A

the maximum frequency within the analog system

39
Q

Nyquist theoem states that sampling frequency should be BLANK times the maximum frequency within the analog system

A

2 times

40
Q

what is the maximum frequency of ground reaction force during walking

A

15Hz

41
Q

if the maximum frequency of ground reaction force during walking is 15 Hz (analog), what should the sampling frequency be

A

15 x 2
=30 Hz

POTH 225: BIOMECHANICS (15 decks)

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