CBEP - Group 1

Work

- A measure of energy expended in moving an object - Most commonly, force times displacement - No work is done if the object does not move

Quick access toolbar

- It is located at the top of the ribbon panel and right of the application menu - it consists of the set of frequently used commands

Ctl + Shift + S

- Save the drawing as a new file. - in short this is the hot key for "save as" command

Translational motion

- any motion in which every line in the body remains parallel to its original position at all times - no rotation of any line in th body - in rectilinear translation, all points in the body move in parallel straight line - in curvilinear translation, all points move on congruent curves

File tab

- consists of the current drawing files open on the screen. - we can click on the + to add a new tab on the file tab

Rigid bodies

- defined as a definite amount of matter the parts of which are fixed in position relative to each other - is a body whose changes in shape are negligible compared w/ overall dimensions of the body

Status bar

- displays the drawing tools that affect the drove in environment - it provides quick access to most of the commonly used drawing tools

Kinematics

- forces acting on moving bodies - study of motion WITHOUT reference to the forces which causes motion

User Coordinate System (UCS)

- is the active coordinate system that represents the XY plane in 2D and XYZ planes in 3-D. - it acts as the direction in the XY and Z-axis for drawing and modeling

Autodesk AUTOCAD

- stands for Autodesk Computer-Aided Design. - It is a drafting and design software application developed and marketed by Autodesk. - It is a commercial 2D and 3D drafting software - Is used for several applications, including floor plan design, blueprints for buildings, bridges, chip design, etc

Mass

- the quantitative measure of inertia or resistance to the change in motion of a body. - considered as the quantity of matter in a body as well as the property which gives rise to gravitational attraction.

Power

- time rate of doing work - the rated machine capacity - is a scalar quantity - the SI units are: N*m/s = J/s

Kinetics

- without any reference to forces responsible for motion (?) - it relates to the action of forces on bodies their resulting motion

2D CAD - 2.5 CAD - 3D CAD - CAD using neutral file formats - CAD using native file formats

1 to 5 versions of CAD

Newton's Law 1

A particle remains at rest or continues to move with uniform velocity (in a straight line with a constant speed) if there is no unbalanced force acting on it.

UNITS

Alter the unit settings of the drawing

X (Explode)

Breaks a compound object into its component objects.

ESC

Cancel current command

Ctrl + Shift + L

Change text into lowercase

Control plus shift plus you

Change text into upper case

Ctrl + 0

Clear screen to show only the drawing area and hides palletes and tabs

Autodesk AUTOCAD, FreeCAD, Autodesk TINKERCAD, SolidWorks, Autodesk INVENTOR

Example of CAD Softwares

Control queue

Exit from all the drawings created in AutoCAD

components

Forces acting at some angle from the coordinate axes can be resolved into mutually perpendicular forces called ___________.

W=mg

Formula for Apparent weight

em=Poutput/Pinput

Formula for mechanical efficiency

Variable Angular Acceleration

Implies that the rate of angular velocity is not uniform

XA (XATTACH)

Insert a DWG file as an external reference (xref)

Rotational motion

Involving a rotation or revolution around a fixed chosen axis (an axis which does not move)

3 Dimensional CAD (3D CAD)

Is a step up from the 2D CAD software. It has become an increasingly popular design tool which allows creation of 3-D images that are realistic.

Computer-Aided Drafting

Is a technical process in which engineering or design-related personnel use computer systems and software to draft architecture or objects

2 Dimensional CAD (2D CAD)

Is the Pioneer of CAD software and relies on basic geometric shaps like lines, rectangle, circles, etc. to produce flat drawings

Equilibrium

It is a condition in which the resultants of all forces acting on the body is zero.

Non con-current Force System

It is a two or more forces whose magnitudes are equal but act in opposite directions with common line of action.

Model space/workspace/drawing window

It is defined as the area to create 2D and 3-D drawings models and objects

Application menu or bottom

It is present at the upper left corner of the work space

Navigation bar

It is used to access the navigation tools it is a user interface element where we can access both unified common tools and product specific tools unique product tools

Ribbon pannel

It provides access to the dialog box related to that panel

Command line window

It used to write the commands

Modify out tab

It's defined as A2D working environment for creating the drawing sheets

Translation

Motion of a body on a linear path, without deformation or rotation

Ctrl + O

Open a drawing

Ctrl + N

Open a new drawing tab in AutoCAD

Ctrl + 8

Open a quick calculator inside the AutoCAD user interface to perform simple and complex calculations

Ctrl + 2

Open the design center palette which contains many AutoCAD blocks

Ctrl + 1

Open the properties palette which lists the properties of the object

Controller why

Redulast option

OVERKILL

Remove overlapping or unnecessary geometries from the drawing

ORBIT

Rotate the view in 3-D space but constrained to horizontal and vertical orbit only

Ctrl + A

Select all elements in the drawing at once

Ctrl + Shift + C

Special copy shortcut

Newton's Law 2

The acceleration of a particle is proportional to the resultant force acting on it and is in the direction of this force.

Newton's Law 3

The forces of action and reaction b/w interacting bodies are equal in magnitude, opposite in direction, and collinear.

Efficiency

The ratio of the work done by a machine to the work done on the machine during the same time interval is called mechanical efficiency of the machine

Ctrl + 9

Toggle the visibility of the command line

Con-current Force System

Two or more forces whose lines of action intersect at the same point to cause rotation.

Ctrl + Z

Undo last action

BREAK

Use to break 2D geometries at 1 or 2 points

I (Insert)

Use to insert an existing block or a drawing as a block

TR

Used for trimming a geometry

F (Fillets)

Used to add rounded corners to the sharp edges of the geometry, these round corners are also called fillets

SC

Used to change the scale of an object

O (Offset)

Used to change the scale of an object.

LA (LAYER)

Used to open the layer properties manager palette which is a tool for creating and managing layers in a drawing

OOPS

Used to restore the last deleted object in your drawing

Time

a measure of the succession of events, thus, considered as absolute quantity in Newtonian Mechanics

Curvilinear motion

a particle moves along a curve rather than a straight line

Rectilinear motion

a particle moving along a straight line

Force

a physical quantity that denotes ability to push, pull, twist, or accelerate a body.

Concurrent forces

all forces lies only in one point

Coplanar forces

all forces on a certain body lies in one plane

Free fall

an object moving under the influence of the gravitational force only

Statics

deals with the forces and their effects, while acting upon the bodies at REST

Dynamics

deals with the forces and their effects, while acting upon the bodies in MOTION

Rising objects

decelerate at the same rate that falling objects accelerate

Gravitational Potential Energy

defined as the work done (mgh) against the gravitational field to elevate the particle of a distance (h) above some arbitrary reference plane (called datum)

Free Body Diagram

diagrams used to show the relative magnitude and direction of all forces acting upon an object in a given situation

Engineering Mechanics 1

focuses on the study of different principles of STATICS, RESULTANT OF FORCE SYSTEMS, EQUILIBRIUM FORCE, ANALYSIS OF STRUCTURES AND FRICTION

Engineering Mechanics 2

focuses on the study of principles of dynamics, rectilinear translation, motion with constant acceleration etc.

Non-coplanar forces

forces acts on two or more planes

Parallel

forces are parallel to each other

Non-concurrent forces

forces originates from different forces

F=ma

formula for Newton's Second Law

Variable acceleration

implies that the rate of change of velocity is not uniform

Particle

is a body of negligible dimensions

Force System

is any arrangement where two or more forces act on a body

Forces

is anything that tends to change or break

View cube

is termed as the navigation tool that is displayed when we are working on a 2D or 3-D model space

Instantaneous acceleration

is the limiting value of the average acceleration as the time interval approaches to zero

Velocity

is the measure of the rate of change in the position of a particle

General plane motion of a rigid body

it is a combination of translational and rotation

Rotational motion

motion involving a rotation or revolution around a fixed chosen axis (which does not move)

Resultant

overall results or effects of the forces on a certain body

Scalar

quantities that are fully described by a magnitude alone

Vector

quantities that are fully described by both a magnitude and a direction

Displacement

represents the vector change of position and is clearly independent of the choice of origin

Mouse cursor

the cursor used to draw figures

Space

the geometric region occupied by bodies

Apparent weight

the gravitational attraction of the earth on a body of mass

Force

the vector action of one body on another