Clipart illustrations of a simple machine, gears. Gears are used by connecting them to an axle, and using the interconnecting cogs to move other gears or parts of a system. Their mechanics are similar to the wheel and axle.

| Clock, Wheels of a
A clock is run by wheels. Each wheel turns another to keep the clock running....| | Cog-wheel
"A small projection in machinery, used to impart motion. C. wheel, a wheel having cogs on its circumfrence." — Williams, 1889...| | Crown-wheel
A wheel with cogs or teeth at right angles to its plane....| | Drill, twist bit
Twist drill bit....|
| Epicycloidal Teeth
"Epicycloidal teeth, teeth for gearing cut in the form of an epicycloid." -Whitney, 1911...| | Epicycloidal Wheel
A wheel or ring fixed to a framework, toothed on its inner side, and having in gear with it another toothed wheel of half the diameter of the first, fitted so as to revolve around the center of the la...| | Epicycloidal Wheel

"Epicycloidal wheel, a wheel or ring fixed to a framework, toothed on its inner side, and having in gear with it another toothed wheel, of half the diameter of the first, fitted so as to revolve about...| | Gear, Bicycle Sprockets

"For sprockets of different diameters, small rings D are used, of different diameters. The nut C is screwed on and off by a wrench; it has grooves, in order to get rid of the turnings that fall on th...| | Gearing

A train of wheels for transmitting and varying motion in machinery....| | Gears
"It is found preferable, therefore, when a great difference of velocity is required, to use a combination of wheels, of moderate size. In the following figure, three wheels are seen thusly connected....| | Gears

A pinion and spur gear meshed together. ...|
| Mitre-wheels
"2 wheels revolving in contact, but in different planes, so as to transfer motion from one plane to another." — Williams, 1889...| | Planet wheel
The...

...Experiment 1.7: Graphical Analysis of Motion
Introduction
To graphically analyze motion, two graphs are commonly used: Displacement vs. Time and Velocity vs. Time. These two graphs provide significant information about motion including distance/displacement, speed/velocity, and acceleration. The displacement and acceleration of a moving body can be obtained from its Velocity vs. Time graph by respectively finding the area and the slope of the graph.
Data Tables – Part I
Displacement (m) Time (s)
0.10 m 0.37 s
0.20 m 0.586 s
0.30 m 0.761 s
0.40 m 0.907 s
0.50 m 1.041 s
0.60 m 1.147 s
0.70 m 1.263 s
0.80 m 1.351 s
0.90 m 1.439 s
1.00 m 1.597 s
1.10 m 1.646 s
1.20 m 1.779 s
1.30 m 1.956 s
Part II
Main Photogate at __(m) Time (s) Instantaneous Velocity (m/s)
0.30 m 0.098 s 0.41 m/s
0.40 m 0.072 s 0.55 m/s
0.50 m 0.06 s 0.67 m/s
0.60 m 0.053 s 0.75 m/s
0.70 m 0.047 s 0.85 m/s
0.80 m 0.043 s 0.93 m/s
0.90 m 0.042 s 0.95 m/s
1.00 m 0.038 s 1.05 m/s
1.10 m 0.038 s 1.05 m/s
1.20 m 0.041 s 0.98 m/s
1.30 m 0.049 s 0.82 m/s
1.40 m 0.05 s 0.8 m/s
1.50 m 0.055 s 0.72 m/s
Part III
Estimated area
Velocity vs. Time graph
From t=0s to t=0.8s
0.49 m
Slope @ T= 0.8 s
Displacement vs. Time
= 0.6 m/s
Velocity vs. Time
= 0.3 m/s2
(Work shown on graph paper)
Summary Questions
1) Describe the meaning of the slopes of the graphs you obtained in Part...

...___________________________________ )
MOTION IN LIMINE TO EXCLUDE TESTIMONIAL EVIDENCE OF ALLEGED GANG AFFILIATED COMMENTS BECAUSE OF THE PREJUDICIAL EFFECT OUTWEIGHS THE PROBATIVE VALUE OF THE EVIDENCE
COMES NOW the Defendant, William Lloyd, by and through counsel, Laura Poschen, and requests the Court to exclude from evidence at the trial of this matter the alleged statement “Street Vice Lords rule” as overheard by Ms. Mary Martinez. In support of thismotion in limine, the Defendant offers the arguments and authorities contained herein.
Facts
1. On May 12, 2011, at approximately 10:00 a.m., the First Security Bank, located at 100 Main Street, Nita City, Nita, was robbed.
2. Ms. Mary Martinez stated that two men began robbing the bank. Upon completing the robbery, the robbers left the bank.
3. Ms. Mary Martinez reported hearing one of the bank robbers yell, “Street Vice Lords rule.” The defendant moves in limine to exclude this testimony and any reference of gang affiliation from the trial of this matter.
Arguments and Authorities
The purpose of motions in limine is “ ‘to aid the trial process by enabling the Court to rule in advance of trial on the relevance of certain forecasted evidence, as to issues that are definitely set for trial, without lengthy argument at, or interruption of, the trial.’ ” Palmieri v. Defaria, 88 F.3d 136, 141 (2nd Cir.1996) (quoting Banque Hypothecaire Du Canton De Geneve v. Union...

...
Rizal Technological University
College of Engineering and industrial Technology
Boni Avenue, City of Mandaluyong
“Motion Study and
Micro-motion Study Equipment”
Artiga, Odiboy R.
Espiritu, Robert C.
Course/Year: BSIE 3rd year
Subject: Methods Engineering
Day/Time: Monday/Thursday 10:30am-12:00pm
Instructor: Engr. Nestor Japis
Motion study involves the analysis of the basic hand, arm, and body movements of workers as they perform work.
Work design involves the methods and motions used to perform a task.
This design includes
the workplace layout and environment.
the tooling and equipment (e.g., work holders, fixtures, hand tools, portable power tools, and machine tools).
work design is the design of the work system.
Basic Motion Elements
Any manual task is composed of work elements, and the work elements can be further subdivided into basic motion elements. We will define basic motion elements and how they can be used to analyze work
Frank Gilbreth was the first to catalog (list) the basic motion elements.
Therbligs are the basic building blocks of virtually all manual work performed at a single workplace and consisting primarily of hand motions. – A list of Gilbreth’s 17 therbligs is presented along with the letter symbol used for each as well as a brief description.
With some modification, these basic...

...CBSE TEST PAPER-02 CLASS - IX Science (Motion)
1.
If a body starts from rest, what can be said about the acceleration of body? (a) Positively accelerated (c) Uniform accelerated (b) Negative accelerated (d) None of the above
[1]
2.
What does slope of position time graph give? (a) speed (b) acceleration (c) uniform speed
[1]
(d) Both (a) and (c) depending upon the type of graph. 3. When a body moves uniformly along the circle, then:(a) its velocity changes but speed remains the same (b) its speed changes but velocity remains the same (c) both speed and velocity changes (d) both speed and velocity remains same 4. Which of the following statements is correct? (a) speed distance are scalar, velocity and displacement are vector (b) speed distance are vector, velocity and displacement are vector (c) speed and velocity are scalar, distance and velocity are vector (d) speed and velocity are vector, distance and displacement are scalar 5. A car travels at a speed of 40km/hr for two hour and then at 60km/hr for three hours. What is the average speed of the car during the entire journey? 6. The velocity time graph of two bodies A and B traveling along the +x direction are given in the figure (a) Are the bodies moving with uniform acceleration? (b) Which body is moving with greater acceleration A or B? 7. Derive the second equation of motion, s = ut +
1 2 at numerically? 2
[1]
[1]
[2]
[2]
[2]
8.
Calculate the acceleration and distance of the...

...Homework
Linear Motion (Ch. 2 & 3)
Essential Questions:
1) How would you describe constant and accelerated motions?
2) How is motion represented graphically and analytically?
3) How does an x vs. t graph differ between constant and accelerated motions?
P. 52-53 #46, 48, 50, 53
P. 80-83 #58, 59, 87, 89, 98, 106
If I don’t give the answer, you will have to determine it yourself. SHOW YOUR WORK!
P. 52
50) 1.5x1011 m
53) 1.8 min
P. 80
87) a. 75 m
b. 150 m
c. 125 m
d. 5.0x102 m
89) a. 43 m
b. 43 m
98) a. -78 m/s
b. -3.1x102 m
106) a. -276 m
b. 7.50 s
Adv. Physics – Unit 1 Homework
Linear Motion (Ch. 2 & 3)
Essential Questions:
1) How would you describe constant and accelerated motions?
2) How is motion represented graphically and analytically?
3) How does an x vs. t graph differ between constant and accelerated motions?
P. 52-53 #46, 48, 50, 53
P. 80-83 #58, 59, 87, 89, 98, 106
If I don’t give the answer, you will have to determine it yourself. SHOW YOUR WORK!
P. 52
50) 1.5x1011 m
53) 1.8 min
P. 80
87) a. 75 m
b. 150 m
c. 125 m
d. 5.0x102 m
89) a. 43 m
b. 43 m
98) a. -78 m/s
b. -3.1x102 m
106) a. -276 m
b. 7.50 s
Adv. Physics – Unit 1 Homework
Linear Motion (Ch. 2 & 3)
Essential Questions:
1) How would you describe constant and accelerated motions?...

...of the students motion matches the given graph.
Graph 01b:
Graph 01d:
Graphical Analysis of Motion:
A student is asked to walk on a straight line for 10s and measure the distance and then solve for the Total displacement, Average Velocity, Instantaneous Velocity. Table 3.1 shows the calculations and results
Table 3.1
Reaction Time:
Time | Total Displacement | Average Velocity | Instantaneous Velocity |
1 | 1 m | 1 m/s | 2 m/s |
2 | 1.98 m | 0.99 m/s | 1.96 m/s |
3 | 2.48 m | 0.83 m/s | 1.66 m/s |
4 | 2.88 m | 0.72 m/s | 1.44 m/s |
5 | 3.66 m | 0.73 m/s | 1.46 m/s |
6 | 4.51 m | 0.75 m/s | 1.50 m/s |
7 | 5.14 m | 0.74 m/s | 1.48 m/s |
8 | 5.54 m | 0.69 m/s | 1.38 m/s |
9 | 6.25 m | 0.69 m/s | 1.38 m/s |
10 | 6.88 m | 0.69 m/s | 1.38 m/s |
This experiment made one of a student catch a meter stick with the use of a thumb and index finger. The student positioned his/her thumb at 50 cm. another experiment is when the student was disturbed while catching the meter stick.
The group used the given formula to calculate the reaction time of each student.
Student | Reaction Time (s) | Reaction Time While Calling (s) |
1 | 0.36 s | 0.37 s |
2 | 0.36 s | 0.38 s |
3 | 0.40 s | 0.41 s |
4 | 0.37 s | 0.41 s |
5 | 0.37 s | 0.42 s |
Human Motion
Most human movement is general motion, a complex combination of lin- ear and angular motion components....

...groove that imparts motion to a follower
➢ Cams are very important and frequently occurring elements in many types of machines – especially AUTOMATIC MACHINES
➢ Cams are the heart of such automatic devices as automatic devices as automatic machine tools, record changers, mechanical calculators, cash registers, and many other devices.
Types of Cams:
Motions Used for Cam Followers:
➢ Themotion of the follower is of primary interest in the analysis of existing cams or in the design of new cams.
➢ It is easier to analyze the motion of cam followers if their motion is plotted as a graph often referred to as DISPLACEMENT DIAGRAM
A. Displacement Diagram
B. Motions that are most commonly used:
1. Uniform Velocity (straight line) motion – UVM
2. Simple Harmonic Motion – SHM
3. Uniformly Accelerated motion (Parabolic Motion) – UAM or PM
4. Modified Uniform-Velocity Motion – MUVM
a. Arc method – MUVM-Arc
b. Uniform Acceleration Method – MUVM-UAM
5. Cycloidal Motion – CM
A. Uniform Velocity Motion (Straight Line Motion)
If the follower is to move with uniform velocity, its displacement must be the same for equal units of time....

...1
Centripetal Acceleration
Imagine a marble sitting on a rotating turntable. The different vectors representing
velocity for the travelling marble are shown below.
Notice that the size of the vector remains the same but the direction is constantly
changing. Because the direction is changing, there is a ∆v and ∆v = vf
- vi
, and
since velocity is changing, circular motion must also be accelerated motion.
vi
∆v vf
-vi
vf2
If the ∆t in-between initial velocity and final velocity is small, the direction of ∆v
is nearly radial (i.e. directed along the radius). As ∆t approaches 0, ∆v becomes
exactly radial, or centripetal.
∆v = vf
- vi
vi
vf
vf
∆v
-vi
Note that as ∆v becomes more centripetal,
it also becomes more perpendicular with vf
.
Also note that the acceleration of an object depends on its change in velocity ∆v;
i.e., if ∆v is centripetal, so is ‘a’.
From this, we can conclude the following for any object travelling in a circle at
constant speed:
The velocity of the object is tangent to its circular path.
The acceleration of the object is centripetal to its circular path. This type of
acceleration is called centripetal acceleration, or ac
.
The centripetal acceleration of the object is always perpendicular to its
velocity at any point along its circular path.
v
ac
ac
v 3
To calculate the magnitude of the tangential velocity (i.e., the speed) of an
object travelling...