Test 2- Part 2: Laws of Motion Flashcards Preview

KIN245 > Test 2- Part 2: Laws of Motion > Flashcards

Flashcards in Test 2- Part 2: Laws of Motion Deck (58):
1

What are the two types of motion?

Linear motion
Angular motion

2

Motion cannot occur w/ out what?

Force (muscular system)

3

What is linear motion aka?

Translatory motion

4

Distance that a system moves in a straight line

Linear displacement

5

What are the two types of linear motion/.

Rectilinear motion
Curvilinear motion

6

Motion along a straight line

Rectilinear motion

7

Motion along a line

Linear motion

8

Motion along a curved line

Curvilinear

9

Rotation around an axis

Angular (rotary motion)

10

Where in the body are the axis of rotation provided by?

Joints

11

_________ motion of joints produces the _______ motion of walking

Angular
Linear

12

Change in position or location of an object from its original point of reference

Displacement

13

Actual sum length it is measured to have traveled

Distance (path of movement)

14

Change in location of a rotating body

Angular displacement

15

Distance that a system moves in a straight line

Linear displacement

16

How fast an object is moving, or distance that an object moves in a specific amount of time

Speed

17

Rate at which an object changes position. Includes the direction & describes the rate of displacement

Velocity

18

Explain the law of inertia

A body in motion tends to remain in motion at the same speed in a straight line unless acted on by a force; a body at rest tends to remain at rest unless acted on by a force

19

Resistance to action or change (acceleration/deceleration)

Inertia

20

How do muscles produce force?

Stop motion
Start motion
Accelerate motion
Decelerate motion
Change direction of motion

21

The greater an objects mass, the greater the __________

Inertia

22

More mass=

More force needed to significantly change an object's inertia

23

Any activity carried out at a steady pace in a constant direction will ___________ energy

Conserve (endurance runners)

24

Explain the law of acceleration

A change in the acceleration of a body occurs in the same direction as the force that caused it.
The change in acceleration is directly proportional to the
force causing it and inversely proportional to the mass of the body.

25

The rate of change in velocity

Acceleration

26

The amount of matter in the body

Mass

27

Explain the law of reaction

For every action there is an opposite reaction

28

Force on the surface reaction to the force we place on it

Ground reaction force

29

We provide the _______ force while the surface provides the _______ force

Action
Reaction

30

Force that results from the resistance between surfaces of two objects from moving upon one another

Friction

31

On slick (wet) ground our shoe friction is ________ & we are more likely to slip

Reduced

32

The amount of friction between two objects that have not yet begun to move

Static friction

33

Friction occurring between two objects that are sliding upon one another

Kinetic friction

34

_______ friction is always greater than ________ friction

Static
Kinetic

35

How might you increase static friction?

Increasing the normal or perpendicular forces pressing the two objects together such as in adding more weight to one object sitting on the other object

36

Ration of force needed to overcome the friction over the force holding the surfaces together

Coefficient of friction

37

Resistance to an object rolling across a surface such as a ball rolling across a court or a tire rolling across a ground

Rolling friction

38

The ability to control equilibrium (either static or dynamic)

Balance

39

State of zero acceleration where there is no change in the speed or direction of the body, maybe either static or dynamic

Equilibrium

40

Body is at rest or completely motionless

Static equilibrium

41

All applied & inertial forces acting on the moving body are in balance, resulting in movement with unchanging speed or direction

Dynamic equilibrium

42

To control equilibrium & achieve balance, ________ needs to be _________

Stability
Maximized

43

Change in the body's acceleration; disturbance of the body's equilibrium

Stability

44

Point at which all of the body's mass & weight are equally balanced or equally distributed in all directions

Center of gravity

45

How is stability enhanced?

Finding body's center of gravity & appropriately changing it

46

A person has balance when the _____ falls within _______

Center of gravity
Base of support

47

A person has balance in the direct proportion to the _______

Size of the base

48

The ________ a base of support, the ______ balance

Larger
More

49

A person has balance depending on the _____

weight (mass)

50

The more _______, the _____ balance

Greater
More

51

A person has balance, depending on the _______ of the center of gravity

Height

52

The ________ the center of gravity, the ______ balance

Lower
More

53

A person has balance, depending on where the __________ is in relation to the ____________

Center of gravity
Base of support

54

Balance is less if the center of gravity is near the _______ of the base

Edge

55

In anticipation of an oncoming force, stability may be _________ by enlarging the size of the base of support in the direction of the anticipated force

Increased

56

__________ may be enhanced by _________ the friction between the body & the surfaces it contacts

Equilibrium
Increasing

57

________ about an axis aids balance

Rotation (moving bike is easier to balance than a stationary bike)

58

_________ _______ functions contribute to balance

Kinesthetic physiological (sight, touch, sense)