Quiz 1

Question 1

Study of forces and their effects

Answer 1

Mechanics

Question 2

Motion of objects, including: displacement, acceleration and velocity

Answer 2

Kinematics

Question 3

Study of relationships btw force system and the changes it produces in body motion

Answer 3

Kinetics

Question 4

Uses principles of mechanics for solving problems related to bio/physiologic systems

Answer 4

Biomechanics

Question 5

Scalars are ____ only

Answer 5

Magnitude

Question 6

Examples of scalars

Answer 6

Distance
Speed
Mass

Question 7

Vectors are ____ and ____

Answer 7

Magnitude and direction

Question 8

Examples of vectors

Answer 8

Displacement
Velocity
Acceleration
Weight
Momentum
Force

Question 9

How much ground an object has covered during its motion

Answer 9

Distance

Scalar quantity

Question 10

How far out of place an object is; overall change in position

Answer 10

Displacement

Vector quantity

Question 11

How fast an object is moving

Answer 11

Speed

Scalar quantity

Question 12

Speed =

Answer 12

Distance/time

Question 13

Speed is ____ of direction

Answer 13

Ignorant

Question 14

Rate at which an object changes its position

Answer 14

Velocity

Vector quantity

Question 15

Velocity =

Answer 15

Displacement/time

Question 16

Velocity is direction ____

Answer 16

Aware

Question 17

HVLA

Answer 17

High velocity low amplitude

Question 18

Rate at which an object changes its velocity

Answer 18

Acceleration

Question 19

Acceleration =

Answer 19

Velocity/time

Question 20

Acceleration is a

Answer 20

Vector quantity

Question 21

Direction of acceleration depends on

Answer 21

Object speeding up/slowing down

Object moving in + or - direction

Question 22

Amount of matter contained by the object

Answer 22

Mass

Question 23

Mass is a

Answer 23

Scalar quantity

Constant

Question 24

Force of gravity acting upon that object

Answer 24

Weight

Question 25

Weight is a

Answer 25

Vector quantity

Question 26

As centers of two bodies are moved farther apart, the gravitational attraction btw them ___

Answer 26

Dec. **and vice versa**

Question 27

Weight is ___ on the poles

Answer 27

Higher — your center closer to center of earth

Question 28

Quantity of motion an object possesses

Answer 28

Momentum

Question 29

Momentum =

Answer 29

Mass x velocity

Question 30

Momentum is a

Answer 30

Vector quantity

Question 31

Something that has a lot of momentum is going to be

Answer 31

Hard to stop

Question 32

Action upon a body causing it to deform or move

Answer 32

Force

Question 33

Newton is the amount of force required to

Answer 33

Give 1kg mass acceleration of 1meter/s2

Question 34

Force =

Answer 34

Mass x acceleration

Question 35

To increase force we either inc ___ or ____

Answer 35

Mass; acceleration | Or both

Question 36

Resistance to have its state of motion changed by application of a force

Answer 36

Inertia

Question 37

Law of Inertia (Newtons 1st law)

Answer 37

An object at rest stays at rest; an object at motion stays in motion UNLESS acted upon by an unbalanced force

Question 38

A system in equilibrium is either

Answer 38

At rest or moving w/ constant velocity

Question 39

Law of Force and Acceleration (Newton’s 2nd Law)

Answer 39

Acceleration of an object directly depends on net force acting up it Inversely upon mass of the object

Question 40

Observed change in motion

Answer 40

Acceleration

Question 41

Law of action and reaction (newton’s 3rd Law)

Answer 41

For every action, there is an equal and opposite reaction

Question 42

Normal stress

Answer 42

Intensity of force perpendicular to surface on which it acts

Question 43

Shear stress

Answer 43

Intensity of force parallel to surface on which it acts

Question 44

Higher friction coefficient means that

Answer 44

It is harder to get an object into motion

Question 45

Static friction

Answer 45

Two contacting surfaces not currently sliding but have potential for movement

Question 46

Kinetic friction

Answer 46

Two surfaces are already sliding relative to each other

Question 47

Kinetic friction AKA

Answer 47

Dynamic friction

Question 48

Magnitude of applied force acting over a given area

Answer 48

Pressure

Question 49

P =

Answer 49

F/A

Question 50

When an object is displaced by application of force

Answer 50

Work

Question 51

Work =

Answer 51

Force x distance

Question 52

Work can be

Answer 52

Positive or negative

Question 53

Changes in velocity have ___ effects on kinetic energy

Answer 53

Large Because velocity is squared

Question 54

KE =

Answer 54

1/2mv^2

Question 55

Axis of rotation

Answer 55

Point about which a body rotates

Question 56

Lever arm

Answer 56

Perpendicular distance from axis of rotation

Question 57

Product of force and lever arm; tendency of force to rotate an object around an axis

Answer 57

Torque

Question 58

We move because of

Answer 58

Torque Muscles apply eccentric forces to bones

Question 59

Type 1 lever

Answer 59

Fulcrum between effort and load/resistance

Question 60

Type 2 lever

Answer 60

Load/resistance between fulcrum and effort

Question 61

Type 3 lever

Answer 61

Effort between fulcrum and load/resistance

Question 62

Type 1 lever example on body

Answer 62

Head/neck

Question 63

Type 2 lever example on body

Answer 63

Leg/ankle

Question 64

Type 3 lever example on body

Answer 64

Elbow

Question 65

Moment arm =

Answer 65

Force x lever arm distance

Question 66

>1 mechanical advantage in

Answer 66

Force

Question 67

<1 mechanical advantage in

Answer 67

Speed and range of motion

Question 68

If fulcrum is directly in middle of lever, mechanical advantage is

Answer 68

1.00 — neither force has an advantage

Question 69

Effort farther than load from fulcrum = lever at a ______

Answer 69

Mechanical advantage Speed and distance = disadvantage

Question 70

Effort nearer than load to fulcrum = lever at a _______

Answer 70

Mechanical disadvantage Speed and distance = advantage