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Biomechanics 2241 > LECTURE #6 - linear kinematics (2) > Flashcards

LECTURE #6 - linear kinematics (2) Flashcards

1
Q

what are kinematics ?

A

describes ,motion in regards to the position, velocity, and acceleration of object without considering the forces causing motion

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2
Q

what is distance ?

A

length of a path followed by object from initial to final position

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3
Q

TRUE OR FALSE

distance is necessarily a straight line

A

FALSE

not necessarily a straight line

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4
Q

what is scalar quantity ?

A

one magnitude

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5
Q

length of path is described by what term ?

A

distance

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6
Q

what is displacement ?

A

straight line distance in a specific direction from initial to final position

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7
Q

“as the crow flies” is used for what term ?

A

displacement

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8
Q

what is the formula for displacement ?

A

displacement = position (final) - position (initial)

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9
Q

TRUE OR FALSE

distance and displacement = the same thing ?

A

FALSE

distance doesn’t = displacement

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10
Q

which line in a graph is displacement ?

A

the straight line from the initial to the final

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11
Q

TRUE OR FALE

think of resultant as the displacement

A

TRUE

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12
Q

how do we calculate displacement :

A

x1,y1 & x2,y2 is resultant
- use SOHCAHTOA (in this case tan) and solve the missing sides
0 used pythagorean theorem

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13
Q

what sport did we discuss displacement for ?

A

tennis

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14
Q

describe some points based of the tennis video :

A
  • no more line judges
  • evolution in business and the sport of tennis
  • cost expensive
  • clear application that influences tennis
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15
Q

what is speed ?

A

rate of motion

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16
Q

how to calculate speed ?

A

Δ displacement / Δ time

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17
Q

TRUE OR FALSE

scalar quantity is magnitude only

A

TRUE

18
Q

what term is used for how long it takes to accomplish a rate of motion/speed/movement ?

A

time

19
Q

what is velocity ?

A

displacement of an object over time

20
Q

what is the formula for velocity (v) ?

A

v = Δ displacement / Δ time

21
Q

TRUE OR FALSE

the friction of velocity (v) is negative or positive

A

TRUE

22
Q

TRUE OR FALSE

direction of motion influences velocity direction

A

TRUE

23
Q

what formula is used to find the resultant ?

A

pythagorean theory

24
Q

what are the two methods of instantaneous velocity ?

A
  • central difference method
  • tangent
25
Q

what does it mean when velocity is positive ?

A
  • going upwards
  • gain in position
26
Q

what does it mean when velocity is straight line ?

A
  • vertical velocity is 0
  • constant
27
Q

what does it mean when velocity is negative ?

A
  • going downwards
  • lose in position
28
Q

TRUE OR FALSE

rate of change in velocity is a vector quantity (acceleration)

A

TRUE

29
Q

TRUE OR FALSE

acceleration occurs if velocity magnitude or direction changes

A

TRUE

30
Q

what are the three types of acceleration ?

A

positive negative and zero

31
Q

what does positive acceleration mean ?

A

gaining velocity

32
Q

what does negative acceleration mean ?

A

losing velocity

33
Q

what does zero acceleration mean ?

A

means @ that point you’re at a constant role (it’s remaining constant)

34
Q

is someone described as being “quick” or having “good acceleration” the same as being fast ?

A
  • No !
  • acceleration describes a persons ability to change speed or direction (not top speed)
35
Q

is a 400m runner that is running at a constant speed around a track accelerating ?

A

yes & no
on the straights we are not accelerating because there is no change in direction, but around the curved we are changing directions therefore ac celebration has occurred

36
Q

average vs instantaneous …

what is average ?

A
  • value over an interval or time
  • do not represent max values
37
Q

average vs instantaneous …

what is instantaneous ?

A
  • value at a given moment in time
  • may represent max values
  • approach instantaneous measures with small time intervals
38
Q

what odes magnitude of instantaneous velocity = ?

A

instantaneous see

39
Q

when do we usually see max velocity ?

A

@ around 2/3

40
Q

when do we see max acceleration ?

A

@ beginning

41
Q

what is the formula for acceleration ?

A

velocity / time

Biomechanics 2241 (21 decks)

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