Quiz 1

Question 1

What is the study of forces and their effects

Answer 1

Mechanics

Question 2

Mechanics that deals with geometry of the motion of objects, displacement, acceleration, velocity

Answer 2

Kinematic

Question 3

Study of relationships between force system acting on the body and changes it produces in body motion

Answer 3

Kinetics

Question 4

Uses principles of mechanics for solving problems related to structure and function

Answer 4

Biomechanics

Question 5

What are the three examples of Scalars

Answer 5

Distance
Speed
Mass

MAGNITUDE ONLY

Question 6

What are the 6 vectors

Answer 6

Displacement 
Velocity
Acceleration
Weight
Momentum
Force

MAGNITUDE AND DIRECTION

Question 7

What is speed

Answer 7

Distance/Time

Ignorant of direction

Scalar quantity

Question 8

What is velocity

Answer 8

Displacement/time

Direction aware

Question 9

What is acceleration

Answer 9

Change in Velocity/Time

Vector Quantity, so means it has direction associated with it

Question 10

What is mass

Answer 10

Amount of matter that is in the object

G or KG

Scalar quantity

Question 11

What is weight

Answer 11

measure in N

Is the force of gravity working up on the object

1 kilogram=10 newtons=2.2 pounds

Question 12

What is momentum

Answer 12

Mass*Velocity

P=m*v

Vector quantity

Question 13

What is force

Answer 13

Action of push or pull

Measure in newtons

Vector quantity

F=m*a

Question 14

What is the law of inertia

Answer 14

An object at rest stays at rest and an object in motion remains in motion unless acted upon by an outside force

Question 15

A system in ___________ is either at rest or moving with a constant velocity

Answer 15

Equilibrium

Question 16

Law of force and Acceleration

Answer 16

Newtons 2nd law

The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object

The observed change in motion is called acceleration

Question 17

The law of action and reaction

Answer 17

Newtons 3rd law

For every action, there is an opposite and equal reaction

Question 18

What is normal stress

Answer 18

The intensity of force perpendicular to the surface on which it acts

Question 19

What is shear stress

Answer 19

The intensity of force parallel to the surface on which it acts

Question 20

What is static friction

Answer 20

Exists when two contacting surfaces are not currently sliding relative to each other but do posses the potential for movement

Question 21

This is the ratio required to initiate a sliding motion between two bodies

Answer 21

Coefficient of static friction

Question 22

What is kinetic friction

Answer 22

Friction in cases when the two surfaces are already sliding relative to each other

Aka= dynamic friction

Question 23

As soon as a applied parallel force exceeds the static friction force and the object begins to slide, friction force actually decreases

Answer 23

Coefficient of kinetic friction

Question 24

What is pressure

Answer 24

Is the magnitude of a applied force acting over a given area

p= F/A

Measured as Newtons/meter or pascals (PA)

Question 25

What is tensile strength

Answer 25

Max stretch a material can withstand without rupture of skin = 9.25 N/mm

Question 26

What is work

Answer 26

Is performed when an object is displaced by the application of a force Force x Distance Measure in joules Can be positive or negative

Question 27

What is kinetic energy

Answer 27

The energy an object posses due to motion Measure in joules KE=1/2mv2 Changes in velocity have large effects on kinetic energy

Question 28

What is angular motion

Answer 28

The path of motion around a fixed axis and therefore in a circular path

Question 29

What is angular velocity

Answer 29

Time rate of change of angular position of a rotating body Degrees or radians per unit of time

Question 30

What is angular acceleration

Answer 30

Time rate of change of angular velocity of a rotating body

Question 31

What is the axis of rotation

Answer 31

The point about which a body rotates

Question 32

What is the lever arm

Answer 32

Aka force arm, moment arm Perpendicular distance from an axis of rotation to a line along which a force acts

Question 33

What is torque

Answer 33

Product of force and lever arm

Question 34

We move due to what force

Answer 34

Torque

Question 35

A _______________________ consists of a rigid or semi rigid object (lever) that is capable of rotating about an axis (fulcrum)

Answer 35

Lever system

Question 36

What is a type one lever

Answer 36

Fulcrum between the effort and load, ex. See saw

Question 37

What is a type 2 lever

Answer 37

Load is between the fulcrum and effort Ex. Stapler, wheelbarrow

Question 38

What is a type 3 lever

Answer 38

Effort is between the fulcrum and the load' Ex. Fishing rod, broom

Question 39

Example of type 1 lever in body

Answer 39

Neck

Question 40

Example of type 2 lever in body

Answer 40

Achilles and calcaneous

Question 41

Example of type 3 lever in body

Answer 41

Elbow joint Most common

Question 42

>1

Answer 42

Force advantage

Question 43

<1

Answer 43

Speed and range of motion

Question 44

What is mechanical advantage

Answer 44

Mm/Mr

Question 45

If the fulcrum is directly in the middle of the lever, the ratio is 1.00 which force has an advantage

Answer 45

Neither