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Coaching 250 > Chapter 3-4 Quiz > Flashcards

Chapter 3-4 Quiz Flashcards

1
Q

Newton I

A

Law of Inertia

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2
Q

Newton II

A

Law of Acceleration

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3
Q

Newton III

A

Law of Action/Reaction (sprinter applying force against blocks in start)

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4
Q

What forces work to slow an athlete down?

A

Friction, gravity, and air resistance.

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5
Q

Acceleration of Body Mass

A

proportional to muscular force applied

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6
Q

Force =?

A

Mass * Acceleration

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7
Q

Momentum

A

Quantity of motion that occurs. Quantity of momentum depends on how much mass and how heavy the athlete is.

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8
Q

Momentum =?

A

Mass * Velocity

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9
Q

Impulse

A

application of muscular force to an object over time. Depends on physical capabilities of the athlete. Strong and flexible means more force over greater range of motion (javelin throw).

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10
Q

Cadence

A

rhythmic and cyclic motion of sports skill (rowing, sprinting, speed skating.

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11
Q

Impulse to slow down and stop

A

friction/air resistance
reaction force of the group slows athlete down
enlarge area of impact

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12
Q

Mechanical Work

A

to apply force over a particular distance. If the object doesn’t move, no work is being done.

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13
Q

Power

A

amount of work done over a particular period. P = W/T

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14
Q

Power units

A

1 horsepower = moving 550 lbs 1 ft in one second. 1 horsepower = 745.7 watts

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15
Q

Energy (joules)

A

the ability to do work. to apply force over a distance against resistance.

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16
Q

Mechanical Energy 3 Forms

A

Kinetic energy, gravitational potential energy, and strain energy,

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17
Q

Kinetic Energy (KE = 1/2mv^2)

A

capacity to do work while being on the move. Dispersed through noise and heat.

18
Q

Gravitational potential energy

A

energy an object has by being raised above the earth’s surface. This is a form of stored energy.

19
Q

Strain Energy

A

energy from the ability to restore back to the original shape (bow and arrow).

20
Q

Law of Conservation of Energy

A

energy is never used up.

21
Q

Rebound

A

When objets collide and separate.

22
Q

Recoil

A

force by which objects restore back to their original shapes. Stores as strain energy and is released as kinetic energy.

23
Q

Coefficient of Restitution

A

measurement of the ability of an object to restore to its original shape. Highest COR = 1, lowest COR = 0.

24
Q

Three Types of Frictional Forces

A

static (between two resting objects), rolling (between a surface and a rolling object), and sliding (two objects slide and rub).

25
Q

Axes

A

longitudinal (head to feet), transverse (hip to hip), and frontal (front to back).

26
Q

Angular motion

A

the rotation, twist, or spin through an angle of a certain number of degrees.

27
Q

Lever

A

simple machine that transmits and changes mechanical energy from one place to another.

28
Q

Force Arm

A

Perpendicular distance from axis to where force is applied.

29
Q

Resistance Arm

A

Perpendicular distance from axis to where resistance is applied.

30
Q

Fulcrum (axis)

A

pivot point at which the lever rotates

31
Q

Torque

A

a rotary, turning, or twisting effect produced by a force acting at a distance from the axis of rotation. T = F X D from axis of rotation.

32
Q

First Class Lever FAR

A

axis positioned between force and resistance

33
Q

Second Class Lever ARF

A

Force and resistance on the same side as axis. Force arm always longer than resistance arm.

34
Q

Third Class Lever AFR (most common in the human body).

A

Axis is at one end and the force is always closer to the axis than the resistance. Bicep curl is an example.

35
Q

Angular Velocity

A

the rate of spin of an athlete or an object. all parts of a gymnast rotating around a bar have the same angular velocity, but they have different speeds.

36
Q

Angular refers to..

A

The number of degrees or revolutions.

37
Q

greatest striking portion is created by

A

maximum angular velocity and greatest radial distribution.

38
Q

centripetal force

A

force that pulls an object towards the axis of rotation in order to make it follow a circular path.

39
Q

Centrifugal force

A

force pulling outward on an athlete or object from the axis of rotation.

40
Q

Rotary Inertia

A

tendency to resist rotation. mass and radial distribution of mass determine the rotary inertia.

41
Q

Angular Momentum

A

quantity of motion that a rotating athlete or object possesses.

Coaching 250 (5 decks)

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