Exam 2 - Chapter 3 Kines

Question 1

Forces in nature can do what to motion?

Answer 1

produce, stop or modify motion

Question 2

When force produces a push on an object

Answer 2

compression

Question 3

When force produces a pull on an object

Answer 3

tension

Question 4

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

Answer 4

in equilibrium

Question 5

Force can be generated from _______ and _______ sources.

Answer 5

internal and external

Question 6

The most common internal force is produced by

Answer 6

muscles

Question 7

External forces include what types?

Answer 7

Fluid forces, contact forces, and gravity

Question 8

This external force includes air and liquids

Answer 8

fluid resistance/ fluid force

Question 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

Answer 9

friction/ contact force

Question 10

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

Answer 10

gravity

Question 11

COG stands for what?

Answer 11

Center of Gravity

Question 12

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

Answer 12

COG

Question 13

Forms of fluid resistance include

Answer 13

buoyancy, drag and lift

Question 14

An upward force equal to the weight of the displaced liquid

Answer 14

buoyancy

Question 15

resistance to forward motion, of water over air

Answer 15

drag

Question 16

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

Answer 16

lift

Question 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

Answer 17

Force couple

Question 18

center or point around which an object rotates

Answer 18

axis

Question 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

Answer 19

Linear motion

Question 20

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

Answer 20

magnitude

Question 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.

Answer 21

Point of application

Question 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

Answer 22

rotary motion

Question 23

The turning or rotary effect of a force

Answer 23

torque

Question 24

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

Answer 24

vector

Question 25

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

Answer 25

joint compression

Question 26

A pulling apart of the two joint surfaces

Answer 26

joint distraction (traction)

Question 27

What are Newton's 3 Laws of motion?

Answer 27

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

Question 28

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

Answer 28

Newton's Law of Inertia

Question 29

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

Answer 29

Newton's Law of Inertia

Question 30

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

Answer 30

Newton's Law of Acceleration

Question 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

Answer 31

Newton's Law of Action and Reaction

Question 32

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

Answer 32

Action and Reaction

Question 33

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

Answer 33

inclined plane

Question 35

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

Answer 35

lever

Question 36

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

Answer 36

axis

Question 37

The effort or energy used to move or hold the object

Answer 37

force

Question 38

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

Answer 38

force arm

Question 39

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

Answer 39

resistance

Question 40

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

Answer 40

resistance arm

Question 42

F\_\_\_\_\_R\_\_\_\_\_A is an example of what class of lever?

Answer 42

Second class lever

Question 43

A\_\_\_\_\_F\_\_\_\_\_R is an example of what class of lever?

Answer 43

Third class lever

Question 44

What lever is used more for strength?

Answer 44

2nd class levers

Question 45

What lever is used more for balance and equilibrium?

Answer 45

First class levers

Question 46

What lever is used more for speed and range?

Answer 46

Third class levers