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Biomechanics 2241 > LECTURE #7 - projectile motion > Flashcards

LECTURE #7 - projectile motion Flashcards

1
Q

what are the four important terms of projectile motion ?

A
  • projectile
  • trajectory
  • release
  • apex
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2
Q

what is trajectory ?

A

fight path of a projectile

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3
Q

what is projectile ?

A

object in free-fall that is affected only by gravity and air resistance

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4
Q

what is release ?

A

when object becomes a project (ex. angle of basketball being thrown)

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5
Q

what is apex ?

A

highest point in trajectory (highest point pleasing ball @ the apex)

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6
Q

how many primary purposes in projecting ?

A

5

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7
Q

what are the five primary purposes in projecting ?

A
  • maximize horizontal distance
  • maximize vertical height
  • maximize accuracy
  • maximize accuracy when speed enhances effectiveness
  • maximize time in the air
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8
Q

what are examples of maximize horizontal distance ?

A

javelin, discus, shotput

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9
Q

what are examples of maximize vertical height ?

A

high jump, pole vault, etc.

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10
Q

what are examples of maximize accuracy ?

A

golf, basketball and archery

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11
Q

what are examples of maximize accuracy when speed enhances effectiveness ?

A

baseball throw, football toss, etc.

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12
Q

what are examples of maximize time in the air ?

A

gymnastics, diving, etc.

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13
Q

how many factors influencing projectile motion are there ?

A

3

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14
Q

what are the 3 factors influencing projectile motion ?

A
  1. relative height of release
  2. angle of release
  3. velocity of release
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15
Q

FILL IN THE BLANK

relative height of release = projectile _______

A

projectile height

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16
Q

FILL IN THE BLANK

angle of release = projection _____

A

projection angle

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17
Q

FILL IN THE BLANK

velocity of release = projectile ________

A

projectile velocity

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18
Q

TRUE OR FALSE

magnitude of the velocity = speed

A

TRUE

19
Q

TRUE OR FALSE

more projectile height = more fight time

A

TRUE

20
Q

given a constant projectile velocity & angle : increase or decrease for the following …
__ projectile height → __ flight time → __ horizontal displacement

A

↑ projectile height → ↑ flight time → ↑ horizontal displacement

21
Q

TRUE OR FALSE (release Ht = landing Ht)

time to apex = time to land & v(y) release = v(y) landing

A

TRUE

22
Q

TRUE OR FALSE (release Ht > landing Ht)

time to apex < time to land & v(y) release < v(y) landing

A

TRUE

23
Q

TRUE OR FALSE (release Ht < landing Ht)

time to apex > time to land & v(y) release > v(y) landing

A

TRUE

24
Q

what is projection angle ?

A

influences shape of projectile’s trajectory

25
Q

describe the trajectory of projection θ = 90 degrees → ________ trajectory (v(x) = 0

A

vertical trajectory

26
Q

describe the trajectory of projection θ = 0-90 degrees → ________ trajectory

A

parabolic trajectory

27
Q

describe the trajectory of projection θ = 0 degrees → latter 1/2 _________ trajectory (v(y) initial = 0

A

parabolic trajectory

28
Q

what two thing does optimal projection angle depend on ?

A

depends on goals of performance and projection height

29
Q

define “depends on goals of performance”

A

maximize vertical displacement and maximize horizontal displacement

30
Q

define “depends on projection height”

A
  • release Ht = landing Ht
  • release Ht > landing Ht
  • release Ht < landing Ht
31
Q

give an example of : release Ht = landing Ht

A

kick a ball for a max horizontal displacement

32
Q

give an example of : release Ht > landing Ht

A

throw a ball for a max horizontal displacement

33
Q

give an example of : release Ht < landing Ht

A

throw a ball onto elevated surface

34
Q

what does projectile velocity determine (given a constant projectile angle & height) ?

A

projectile velocity determines magnitude of vertical and horizontal displacement

35
Q

TRUE OR FALSE

velocity is a vector

A

TRUE

36
Q

TRUE OR FALSE

velocity has a horizontal v(x) and vertical v(y) component ?

A

TRUE

37
Q

TRUE OR FALSE

projectile have velocity ?

A

YES

38
Q

describe vertical component v(y) :

A
  • influences max vertical displacement
  • constantly changing due to gravity
39
Q

describe horizontal component v(x) :

A
  • influences horizontal displacement (range)
  • remains constant (assuming minimal air resistance)
40
Q

TRUE OR FALSE

magnitude depends on projection angle

A

TRUE

41
Q

TRUE OR FALSE

gravity is always pulling down ?

A

TRUE

42
Q

do flat angles have smaller/larger horizontal/vertical component ?

A

flat angles have larger horizontal components

43
Q

do steep angles have smaller/larger horizontal/vertical components ?

A

larger vertical component

44
Q

between velocity, height and angle of release what is necessarily the most important ?

A

velocity (can continue to manipulate)

Biomechanics 2241 (21 decks)

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