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SEM 1 Biomechanics > Wk 4 - Linear Kinetics > Flashcards

Wk 4 - Linear Kinetics Flashcards

1
Q

_______ is defined as any interaction, a push or pull b/w 2 objects

A

Force

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2
Q

______ is what causes something to move

A

Kinetics

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3
Q

______ describes how something moves

A

Kinematics

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4
Q

Are forces vector or scalar quantities?

A

Vector (both magnitude and direction)

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5
Q

Forces can ______ motion, ______ motion, ______ or ______ in direction

A

produce motion, stop motion, positive or negative acc or change in direction

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6
Q

Units of measurement for force is…?

A

Newton (N)

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7
Q

Vectors - use arrows: length indicates _____ of force

A

magnitude

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8
Q

Vectors - use arrows: arrow head indicates _____ of force

A

direction

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9
Q

magnitude =

A

Amount of force applied

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10
Q

straight line of infinite length in direction of acting force is the…?

A

Line of application

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11
Q

orientation of the line of application gives an ang position which is the …?

A

Angle of application

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12
Q

a force, velocity, or other vector quantity which is equivalent to the combined effect of two or more component vectors acting at the same point is called a …?

A

resultant

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13
Q

____ ____ is defined to compose or resolve in which there are multiple forces?

A

Force systems

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14
Q

Force systems acting in a single plane is called _____

A

coplanar

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15
Q

Force systems acting at a single point is called _____

A

Concurrent

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16
Q

Force system of vectors acting along a single line is called a _____

A

Collinear

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17
Q

Force system which breaks force into its components with respect to the coordinate system is called _____

A

the resolution

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18
Q

What is Newtons 1st Law?

A

The law of inertia

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19
Q

The law of inertia is…

A

‘A body will maintain a state of rest or constant velocity unless
acted on by an (a NET) external force that changes the state’ of
motion

20
Q

Inertia is defined by…?

A

Reluctance to change state of rest or motion

21
Q

The _____ the mass, the ____ the inertia = harder to move object

A

greater

22
Q

Newtons 2nd Law is the …?

A

Law of acceleration

23
Q

Any time you increase or decrease speed it is…?

A

Accelertion/deceleration

24
Q

Force = ____ x ____

A

Force = mass x acceleration

25
Q

Acceleration = ___ x ___

A

Acc = vel / time

26
Q

______ is a quantity of motion of an object

A

momentum

27
Q

p or m stand for

A

momentum

28
Q

momentum (p) = ____ x ____

A

p = mass x vel

29
Q

Newton’s 3rd law is …

A

The law of reaction

30
Q

The law of reaction (3rd law) means…

A

For each action (force) there is an equal and opposite reaction (force)

31
Q

What is a non contact force?

A

Acts at a distance, not directly in contact with each other (e.g. gravity)

32
Q

Which law is this: ‘All bodies are attracted to one another with a force proportional to the product of their masses and inversely proportional to the distance between them’

A

The law of gravitation

33
Q

What affects the law of gravitation ? (2)

A

Distance between the two and mass

34
Q

The higher the altitude the _____ the gravity

A

Lower

35
Q

Contact forces are

A

exerted by one object in direct contact with another object

36
Q

The max vertical GRF in walking is …

A

1-1.3 of body weight

37
Q

The max vertical GRF in running is…

A

3-5 body weight

38
Q

______ is a contact force acting parallel to the interface of 2 surfaces

A

friction

39
Q

Doe friction always oppose motion?

A

Yes

40
Q

The objects not moving has friction preventing it from moving…

A

Static friction

41
Q

The object is moving but there are still forces trying to oppose the motion

A

Max static friction

42
Q

μ means…

A

the coefficient of friction

43
Q

Once the object is sliding, the frictional force opposing it is ____ than what it was before it started moving

A

less

44
Q

Friction can be change by …?

A

altering both surfaces

45
Q

Is friction related to the area of contact?

A

No. only roughness

46
Q

Can forces be present without motion?

A

Yes

SEM 1 Biomechanics (6 decks)

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