Midterm 2 Flashcards

1
Q

What is a projectile?

A

any object, not in contact with the ground that is allowed to move under the influence of gravity and no other external force.

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2
Q

What kind of path will an object in flight on earth follow?

A

Parabolic

symmetrical curve

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3
Q

When an object is not in contact with the ground what is its horizontal acceleration?

A

0 m/s^2

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4
Q

What is the optimal angle of release for height?

A

90 degrees

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5
Q

What is the optimal angle of release for distance?

A

45 degrees

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6
Q

What does the jump mat measure?

A

It measures time in the air and jump height

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7
Q

What does the force plate measure?

A

Measures the time in the air and calculates initial velocity

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8
Q

What does the Ipod measure?

A

Jump time, measures the period of time when the accelerometer doesn’t measure any force

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9
Q

What are Kinetics?

A

The concepts of mass, force, and energy as they affect motion.

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10
Q

What is Newton’s first 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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11
Q

Explain the difference between static and dynamic equilibrium.

A

Static equilibrium is an object at rest with a net external force of 0 acting on it.

Dynamic equilibrium is an object in uniform motion with a net external force of 0 acting on it.

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12
Q

What is inertia?

A

an objects tendency to resist change in the state of motion

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13
Q

what is the equation for momentum?

A

P = mass x velocity

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14
Q

What is the law of conservation of momentum?

A

In the absence of external forces, the total momentum of a given system is conserved (is constant)

Pbefore = Pafter

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15
Q

What is the coefficient of restitution and what is it used for?

A

it is the absolute value of the ratio of the velocity of separation to the velocity of approach.

It is a means of quantifying how elastic the collisions are.

e = (Vbf - Vaf)/(Vai - Vbi)

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16
Q

What is the COR for a perfectly elastic collision?

A

1

17
Q

What is the COR for a perfectly inelastic collision?

A

0

18
Q

Provide the equation for elastic collisions.

A

MaVai + MbVbi = MaVaf + MbVbf

19
Q

Provide the equation for inelastic collisions.

A

M1V1 + M2V2 = (M1+M2)Vcombined

20
Q

What makes up the Combined Free Limb Relative Momentum?

A

CFLRM = Contralateral Arm RM + Ispsilateral Arm RM + Lead Leg RM

21
Q

What is Newton’s Second law?

A

The law of acceleration

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

22
Q

What is Newton’s Third Law?

A

The Law of Reaction

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

23
Q

What is impulse? Give the equation for it.

A

Impulse is a measure of a force applied for a certain amount of time.

I = Force x Time

I = change in momentum

24
Q

What are two things that the change in the momentum of a system depends on?

A

1) The magnitude of external forces

2) The time over which the forces act

25
Q

What is Friction?

A

The force resisting the relative motion of solid surfaces.

Dry friction
Fluid
Internal

26
Q

What is the equation for the critical point of static friction?

A

F = mew x N

27
Q

What are some characteristics of kinetic friction?

A

As Force applied increases,It remains constant and is always less than Force applied

28
Q

For any incline of a certain angle, what are the equations you can use to find perpendicular, parallel, Normal, Friction

A

Fpd = mg x (Cos(angle))

Fpl = mg x (Sin(angle))

N = -mg x (Cos(angle))

Ff = -mg x (Sin(angle))

29
Q

What is angular kinematics?

A

The study of motion of an object about a circular path exclusive of the influences of mass and force.

30
Q

When does angular motion occur?

A

Angular motion occurs when all points on an object move in a circular path around the same axis

31
Q

Describe absolute angular displacement

A

angular position of an object relative to a fixed position

32
Q

Describe Relative angular velocity

A

angular position of an object relative to a plane or line that is capable of moving

33
Q

In angular kinematics, what direction is considered negative and which is considered positive?

A
Clockwise = negative
Counterclocwise = positive
34
Q

Describe Centripetal Acceleration

A

if something is turning around a circle then it required an external force or acceleration to cause it to change direction

Centre seeking

35
Q

What are the four main components of a signal?

A

Frequency, Amplitude, Off-set, Phase shift

36
Q

What is it called when you convert a time-domain signal to a frequency-domain signal?

A

Fourier Transform