Final Final

Question 1

A body will maintain a state of rest or constant velocity unless cited on by an external force that changes the state

Answer 1

Newtons 1st Law

Question 2

_____ is the tendency to resist change in the current state of motion

Answer 2

Inertia

Question 3

____ is directly proportional to mass and has no unit of measurement

Answer 3

Inertia

Question 4

A force applied to a body causes an acceleration of that body

Answer 4

Newtons 2nd Law

Question 5

_____ is inversely proportional to to the body’s mass

Answer 5

Acceleration

Question 6

For every action there is an equal and opposite reaction

Answer 6

Newtons 3rd Law

Question 7

____ is force acting over the area of contract between two surfaces

Answer 7

Friction

Question 8

Direction of the force of friction is _______ of the motion of the object

Answer 8

opposite

Question 9

_________ is the maximum amount of friction that can be generated between two static surfaces

Answer 9

Maximum static friction

Question 10

_______ is the constant magnitude friction generated between two surfaces in contact during motion

Answer 10

Kinetic friction

Question 11

______ the quantity of motion possessed by an object

Answer 11

Linear Momentum (M)

Question 12

Linear momentum is measured as the product of a body’s ____ and its _____

Answer 12

mass & velocity

Question 13

__________ is the concept that the Toal momentum of a given system remains constant (in the absence of external forces)

Answer 13

Principle of conservation of momentum

Question 14

_______ is the product of a force and the time interval over which the force acts

Answer 14

Impulse

Question 15

What are 3 methods to increase momentum?

Answer 15

1. Up in magnitude of the force
2. up the duration
3. up the overall shape of the force time curve

Question 16

______ is the exchange of a large force during a small time interval

Answer 16

Impact

Question 17

The behavior of two objects post impact depends on:

Answer 17

the collective momentum & nature of impact

Question 18

_______ results in the conversation of the velocity of the system

Answer 18

Perfectly elastic impact

Question 19

______ results in the total loss of system velocity

Answer 19

Perfectly Plastic Impact

Question 20

T/F: Most impacts fall in between perfectly elastic and perfectly plastic

Answer 20

True

Question 21

_______ is the number that serves as an index of elasticity

Answer 21

Coefficient of Restitution

Question 22

______ is the product of a force applied against a resistance and the displacement of the resistance in the direction of the force

Answer 22

Mechanical work

Question 23

W = ____ x ____

Answer 23

force ; displacement

Question 24

Unit of work is the _____

Answer 24

joule

Question 25

if there is ____ displacement, there is ____ work

Answer 25

no ; no

Question 26

____ is the rate of work production

Answer 26

Mechanical power

Question 27

Power = ____ / ____

Answer 27

work ; change in time

Question 28

_____ is the capacity to do mechanical work

Answer 28

Mechanical energy

Question 29

Units of energy are ____

Answer 29

joules

Question 30

____ is the energy that a body had due to its motion

Answer 30

Kinetic energy

Question 31

KE = ___

Answer 31

.5mv^2

Question 32

______ when gravity is the only acting external force, a body mechanical energy remains constant.

Answer 32

Law of conversation of mechanical energy

Question 33

PE + KE = _______

Answer 33

C : constant number that remains unchanged

Question 34

______ is the rotary effect of a force about an axis (angular or equivalent of linear force)

Answer 34

Torque

Question 35

Direction of Torque: - Clockwise = - Counterclockwise =

Answer 35

negative positive

Question 36

_____ is a rigid bar that rotates around an axis (fulcrum)

Answer 36

lever

Question 37

______ = muscle

Answer 37

force

Question 38

______ = object/load

Answer 38

resistance

Question 39

____ = joint

Answer 39

axis

Question 40

F -- A -- R

Answer 40

1st class

Question 41

A -- R -- F

Answer 41

2nd class

Question 42

A -- F -- R

Answer 42

3rd class

Question 43

_____ is the point where the mass and weight of a body are equally balanced in all directions

Answer 43

Center of gravity

Question 44

T/F: Center of gravity may lie outside the physical body

Answer 44

True

Question 45

_____ is the resistance to disruption of equilibrium

Answer 45

Stability

Question 46

____ ability to control equilibrium

Answer 46

balance

Question 47

____ is the area beneath an object/person that includes every point of contact that supports the body

Answer 47

Base of support

Question 48

A larger BOS = _______

Answer 48

greater stability

Question 49

COG close to BOS = ______

Answer 49

greater stability

Question 50

Increased body mass enhances _____

Answer 50

stability

Question 51

Increased friction

Answer 51

improves resistance to movement

Question 52

______ is the inertial property for rotating bodies representing resistance to angular acceleration

Answer 52

Moment of inertia

Question 53

T/F: Moment of inertia is based on both mass and distance the mass is distributed from the axis of rotation

Answer 53

True

Question 54

_______ is the distance form the axis of rotation to a point where the body mass could be concentrated without altering its rotation characteristics

Answer 54

radius of gyration

Question 55

radius of gyration is used as the index for mass distribution for calculating ______

Answer 55

moment of inertia

Question 56

______ is the quantity of angular motion possessed by a body

Answer 56

Angular momentum

Question 57

Principle of conservation of angular momentum states: Whenever _____ is the only acting external force, angular momentum is conserved

Answer 57

gravity

Question 58

_____ produces smaller I as mass is more distributed near axis of rotation, leading to increased w

Answer 58

Tuck position

Question 59

____ produces larger I as mass distributed further from axis of rotation leading to decreased w

Answer 59

Extended position

Question 60

______ is the product of torque and the time interval over which the torque acts

Answer 60

Angular impulse

Question 61

A rotating body will maintain constant rotational motion unless acted on by an external torque that changes the state

Answer 61

Newtons 1st law