SIMPLE MACHINES

Click on the following links to watch  the videos.

Three classes of levers

Types of levers

Exercise

Sammy weighs 9000 kg and Jane weighs 6000 kg. They are both sitting on a seesaw. If

Sammy is seated 6 meters away from the fulcrum, how far should Jane be from the fulcrum?. When solving the problems, draw a diagram of the situation and show your math work.

SIMPLE MACHINES

CLASSIFICATION OF MECHANISMS

A. TRANSMITTING MOTION.

                    - Linear: Lever, Fixed pulley, Movable pulley, Compound pulley.
                    - Rotary: Friction drives, Pulleys with belt, Gear mechanisms, Worm gear, etc.

B. TRANSFORMING MOTION.

                    - Rotary to Linear: Rack and pinion system, Nut and bolt system, Winch and crank handle
                    - Rotary to Reciprocating: Crank-link-slider, Crankshaft, Cam, Eccentric cam

C. CONTROLLING AND REGULATING MOTION.

                   - Disc brakes.
                   - Band brakes.
                   - Drum brakes.

D. STORING ENERGY.

                   - Spring.

E. JOINING ELEMENTS.

                  - Clutch.
                  - Fixed connections.
                  - Movable connections.


EXERCISE : Choose at least three mechanisms and describe them. Include diagrams, pictures, formulas, real applications, etc.You have to do each machine in a single worksheet. 
 It´s not compulsatory. If you do it you can add maximum 0.50 to the final mark of the revision test.

Here you have interesting links to do the work


Mechanisms

Technology student

DEFINITION OF MECHANISM

Mechanisms are devices that transmit and convert forces and motion from a driving force or input element to an output element.
They allow us to carry out certain tasks more easily and more efficiently.

UNIT 8. MECHANISMS.

VOCABULARY

TRANSLATE INTO SPANISH

Inclined plane

Wheel

Axle

Lever

Pulley

screw

wedge

force

speed

ramp

motion

frictionless

pivoting point

 fulcrum

lever

arm,

moment of force

Examples of levers: wheelbarrow, fishing rod, scissors, hole punch,

broom, pincers, scales, tongs, nutcracker, pliers,

fire extinguisher, handle, paper cutter, tweezers,

crowbar, shovel, can opener, stapler, brake, oar, bottle opener,steering wheel,

windlass, coffee grinder, pepper mill, water tap, crane, flag pole, fixed, movable,

http://www.xtec.cat/monografics/cirel/pla_le/nile/carles_egusquiza/student/student.pdf

REVISION ACTIVITIES

PLASTICS, CERAMICS AND FABRIC MATERIALS.

Exercises:
1,3,5,6,7,8,9,12,13,15,17 and 20

You have to do these exercises if you want to add 0.5 to the  final mark of the revision exam. It´s not compulsatory.