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Biomechanics 2241 > LECTURE #9 - linear kinetics > Flashcards

LECTURE #9 - linear kinetics Flashcards

1
Q

how many laws of motion are there ?

A

3

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2
Q

what is the first law of motion ?

A

law of inertia

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3
Q

what is the second law of motion ?

A

law of acceleration

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4
Q

what is the third law of motion ?

A

law of reaction

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5
Q

what is inertia ?

A

objects resistance to change in state of motion

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6
Q

define law of inertia :

A

an object at rest or in motion will stay that way, unless acted upon by a net external force or an unbalanced force

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7
Q

what does “uniform motion” mean ?

A

constant velocity

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8
Q

what does “forced impressed” mean ?

A

external forces

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9
Q

what is bill nye’s description of law of inertia ?

A

inertia is a property of matter

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10
Q

TRUE OR FALSE

with inertia you are maintaining a constant velocity unless a force pushes it ?

A

TRUE

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11
Q

when interpreting law of inertia :
“object at rest and no external forced acting on it” =

A

remains at rest

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12
Q

when interpreting law of inertia : “object in motion and no external forced acting on it” =

A

continues moving at constant velocity

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13
Q

when interpreting law of inertia : “object at rest and external forces do act on it” =

A

object remains at rest only if resultant external forces is zero (net external force = 0)

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14
Q

TRUE OR FALSE

more mass = harder to move (resistance to move)

A

TRUE

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15
Q

TRUE OR FALSE

mass is dependent on inertia (mass with more mass have more inertia; therefore more difficult to cause a change in the state of motion)

A

TRUE

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16
Q

what is momentum?

A

quantity of motion

17
Q

TRUE OR FALSE

momentum is not important in impact situations

A

FALSE

momentum is important in impact situations

18
Q

what are the three points of momentum :

A
  • any object which has both mass & a velocity is said to have momentum
  • static objects has zero momentum
  • momentum is a vector quantity
19
Q

TRUE OR FALSE

products of a body’s mass and velocity is momentum

A

FALSE

20
Q

what is the formula fr momentum ?

A

M= (m)(v)

21
Q

what are the units of measurement for momentum?

A

(kg)m/s

22
Q

describe conservation of momentum :

A

the total momentum of any given system will remain constant unless acted upon by an external force

23
Q

what is meant by a “system” ?

A
  • object (or group of objects) chosen for analysis
  • isolated system : “objects isolated from external forces”
24
Q

TRUE OR FALSE

momentum before impact = momentum ?

A

TRUE

25
Q

talk about the ray lewis vs battering ram video :

A
  • momentum coming from a higher moment
  • quantity of motion
26
Q

what is the formula for force ?

A

mass x acceleration

Biomechanics 2241 (21 decks)

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