♥ JASMINE DNT-ED on Wednesday, March 5, 2008 ♥
hellos , another post today !!
i had alredy wirtten so much on my blog ler , now it's time for a recap !!
there are a total of 22 question ... see if uii can puzzle all the answer in your head XD ...
1)What type of motion is movement backwards and forwards in a straight line?
Reciprocating.
2)Which type of motion describes a child swinging on a swing?
Oscillating.
3)Movement in a straight line called _______ motion.
Linear.
4)One method of transmitting force and rotary motion from one shaft to another is by using _______ .
Pulley wheels and belt.
5)By altering the _____ of pulley wheels in a pulley system it is possible to adjust the speed of output rotation.
Diameter.
6)In simple gear trains the driver and driven gears rotate _______ .
In opposite directions.
7)A crank is a handle like input device that when turned makes parts of a machine _____ .
Move or operate.
8)All mechanisms involve some kind of _____.
Motion and force
9)All mechanisms must produce some kind of _____ .
output.
10)Which type of motion describes the up and down movement of the Carousel horses?
Reciprocating.
♥ JASMINE DNT-ED on ♥
What is a mechanism ? Mechanisms are devices that have been designed to make jobs easier.
They all have certain things in common:
They involve some kind of motion.
They involve some kind of force.
They must have some kind of input to make them work.
They produce some kind of output.
If we connect mechanisms together we can build mechanical systems called machines.
Example is this mechanical dog :)
lalala , this is it !!
this is actually a better view as just now tat one is negative der :)
♥ JASMINE DNT-ED on ♥
wwow , two months never update lerhxx ... haixx , busy ma ... i will update now ...
Many people sometimes didn't understand what the teacher is talking about ...
So today i m gonna talk about technical vocabulary =P
An Axle is :
A rigid rod that connects together a pair of wheels on a vehicle or moving toy.
A Crank is :
A handle like input device that when turned makes parts of a machine move or operate.
A Diameteris :
The length of a straight line drawn across a circle passing through it's centre.
An Eccentricis :
A round shaped cam.
A Follower is :
A rigid rod or part of a mechanism that rest against the edge of a cam moves up and down as a cam rotates.
A Force is :
Forces are pushes or pulls that make things start or stop moving, move faster or slower, change shape or direction.
A Friction is :
The force that stops things from moving freely when they rub against each other.
A Fulcrum is :
The pivot point around which a lever turns.
A Lever is :
A rigid rod pivoted about a fixed axis called a fulcrum.
Linear motion is :
The Movement in a straight line.
A Linkage is :
A series of levers connecting together moving parts of a mechanism.
A Motion is :
A Movement.
An Offset is :
The distance of the centre of a cam or wheel from the centre of rotation of a shaft or axle.
An Oscillating motion is :
Movement backwards and forwards in a circular arc.
A Parallel is :
When two objects or lines are the same distance apart along the whole of their length.
A Pivot is :
The central point or short shaft on which something balances or turns.
A Reciprocating motion is :
Movement backwards and forwards in a straight line.
A Rotary motion is :
The Movement in a circular direction.
A Segment is :
One of several parts or pieces that fit together with others to make up a whole object.
A Shaft is :
A rod in a machine to which cams, gears and pulleys are attached.
A Torque is :
The turning effect of a force in rotary systems. Measured in Newton Metres (Nm).
An Undulate is :
To move in a wave like motion.
JASMINE .
