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EPHE 341 > Linear Kinetics 1 > Flashcards

Linear Kinetics 1 Flashcards

1
Q

What is kinetics

A

The concept of mass, force, and energy as they affect motion

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2
Q

What is Newtons 1st law

A

Law of Inertia - an object at rest tends to stay at rest, and an object in uniform motion tends to stay in uniform motion unless acted upon by a net external force.

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3
Q

What is Inertia

A

Resistance to a change in state of motion

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4
Q

What quantifies inertia

A

Mass

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5
Q

when is an object at rest

A

When the net forces acting on it sum to zero

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6
Q

What is static equilibrium

A

when the sum of the forces acting on the person in all axis directions are zero and the person will maintain their state of rest or zero velocity

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7
Q

What is dynamic equilibrium

A

When an object is in uniform motion. Net forces are equal to zero but an object is in motion

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8
Q

Uniform motion means…

A

constant velocity (so an object will maintain its velocity unless accelerated or decelerated

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9
Q

Constant velocity means

A

no acceleration

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10
Q

What is momentum

A

The tendency for an object to resist change in motion and continue to move in its direction of travel

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11
Q

Is momentum the same as inertia?

A

no but they are related

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12
Q

What is inertia?

A

an objects tendency to resist change in the state of motion (at motion and rest), however during motion an object is said to have momentum)

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13
Q

What is the equation for momentum

A

P = mv

mass x velocity

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14
Q

Is momentum scalar or vector

A

vector

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15
Q

Understanding momentum is really important when…

A

dealing with things that collide

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16
Q

What is the law of conservation of momentum

A

in the absense of external forces, the total momentum of a given system is conserved (is constant)

17
Q

The sum of the momentum before the collision but equal…

A

the sum of momentum after the collision

18
Q

What are two types of collisions

A

elastic and inelastic

19
Q

What are inelastic collisions

A

objects stick together and usually become distorted and generate heat

20
Q

What is the coefficient of restitution

A

a means of quantifying how elastic the collisions are. Defined as the absolute value of the ratio of the velocity of separation to the velocity of approach

21
Q

What is the velocity of approach

A

the difference between the velocities of the two colliding object just before the collision

22
Q

What is the velocity of separation

A

the dfference between the velocities of the two colliding objects just after the collision

23
Q

For perfectly elastic collisions the coefficient of restitution is __

A

1

24
Q

For perfectly inelastic collisions the coefficient of restitution is __

A

0

25
Q

what occurs to the momentum of objects in a perfectly elastic collision

A

each object transfers all of its momentum to the other object

26
Q

What is the transfer of momentum from sit to stand

A

By leaning forward our trunk has momentum which can be used to assist in hip and leg extension

27
Q

During a complex task such as high jump we use transfer of momentum to

A

help us increase our vertical velocity. The free limbs contribute by transferring their individual momentum to the velocity of the whole body

28
Q

In high jump, the combined free limb RM reaches a peak when?

A

Just after the lead leg but just before the arms.

29
Q

the relative momentum of all tfree limbs _____ at take-off

A

reduces

30
Q

What is the law of acceleration

A

A force applied to a body causes an acceleration of that body of a magnitude proportional to the force, in the direction of the force, and inversely proportional to the body’s mass. F = ma

31
Q

What is the law of Reaction

A

Every applied force is accompanied by a reaction force, equal in magnitude and opposite in direction

EPHE 341 (17 decks)

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