Exam 2 - Chapter 3 Kines Flashcards Preview

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Flashcards in Exam 2 - Chapter 3 Kines Deck (46):
1

Forces in nature can do what to motion?

produce, stop or modify motion

2

When force produces a push on an object

compression

3

When force produces a pull on an object

tension

4

When compression and tension are balanced, the object is said to be

in equilibrium

5

Force can be generated from _______ and _______ sources.

internal and external

6

The most common internal force is produced by

muscles

7

External forces include what types?

Fluid forces, contact forces, and gravity

8

This external force includes air and liquids

fluid resistance/ fluid force

9

This external force is described as a force acting in the opposite direction to the desired movement and occurring at the area of contact between the two surfaces

friction/ contact force

10

This external force is measured as the weight of the body though its COG

gravity

11

COG stands for what?

Center of Gravity

12

The point around which the body's mass is evenly distributed

COG

13

Forms of fluid resistance include

buoyancy, drag and lift

14

An upward force equal to the weight of the displaced liquid

buoyancy

15

resistance to forward motion, of water over air

drag

16

change in fluid pressure as a result of differences in air or liquid flow velocities around an object

lift

17

Always produces rotary motion; two or more forces of equal magnitude, but opposite direction, applied to the same object but at different points of application, working together to cause movement

Force couple

18

center or point around which an object rotates

axis

19

Movement along a path pertaining to or representing a line that may be straight or curved. All parts of the object move in the same direction at the same speed

Linear motion

20

size, amount. The pound is the basic unit of measurement in U.S. for the _________ of force

magnitude

21

Spot on the object where the force is put. For muscular force, it is commonly considered to be at the insertion of muscle to bone.

Point of application

22

Turning or movement about an axis; parts of the object further from the axis move at a greater speed than those close to the axis

rotary motion

23

The turning or rotary effect of a force

torque

24

A physical quantity or force possessing both magnitude or size and direction; can be represented by a straight line.

vector

25

The pushing together of both sides of the joint toward the center of the joint

joint compression

26

A pulling apart of the two joint surfaces

joint distraction (traction)

27

What are Newton's 3 Laws of motion?

Newton's Law of Inertia, Newton's Law of Acceleration, and Newton's Law of Action and Reaction

28

If an object is at rest, a force must act on the object to initiate movement

Newton's Law of Inertia

29

If an object is already in motion, it will remain in motion

Newton's Law of Inertia

30

This describes why an object with less mass will move faster than an object with greater mass

Newton's Law of Acceleration

31

This implies that there must be two forces present. Each force acts on the other, with the direction of the forces being opposite and the magnitude of the forces being equal

Newton's Law of Action and Reaction

32

Jumping on a trampoline is an example of which of Newton's Laws?

Action and Reaction

33

A flat surface or plane that is at an angle to the horizontal surface it is placed upon

 

inclined plane

34

35

a rigid bar that rotates about an axis or fulcrum; downward motion at one end causes upward motion at the opposite end

 

lever

36

Also called fulcrum or pivot, the point about which the rigid bar turns

 

axis

37

The effort or energy used to move or hold the object

force

38

Also called effort arm or moment arm; distance from the axis to the point of application of the force

 

force arm

39

The object one is trying to move, sometimes referred to as weight or load

 

resistance

40

Distance from the axis to the point of application of the resistance or load

 

resistance arm

41

42

F_____R_____A  is an example of what class of lever?

 

Second class lever

43

A_____F_____R  is an example of what class of lever?

 

Third class lever

44

What lever is used more for strength?

 

2nd class levers

45

What lever is used more for balance and equilibrium?

 

First class levers

46

What lever is used more for speed and range?

 

Third class levers