pulleys,gears&other wheels

PULLEYS, GEARS & OTHER WHEELS

● BY – GROUP 7● ALAA● FARHAD● HAMAD ● HAMID● HOSAM

PULLEYS

● Pulleys are things that we use daily● WHY DO WE USE PULLEYS?● We use pulleys to lift heavy objects.● For example if a person weights 80 kilos, he

wont be able to lift 80 kilos or 79 kilos . Incase a pulley may come in handy.

A SIMPLE PULLEY

USE OF A PULLEY

GEARS

● A GEAR OR A COG WHEEL IS A ROTATING MACHINE PART,HAVING CUT TEETH WHICH MESH WITH ANOTHER TOOTHED PART IN ORDER TO TRANSMIT TOURQE.IN MANY CASES THE SHAPE & SIZE OF THE TOOTH FOR BOTH THEWHEELS MATCH . THIS MAYBE CONSIDERED AS A SIMPLE MACHINE.GEARS ARE USED IN BIKES , MOTOR BIKES , CARS , ETC.

GEARS IN A WATCH

THERE ARE MANY SHAPES IN GEARS.DIFFERENT SHAPES OF GEARS ARE FOR DIFFERENT USES AND

PAIRS

OTHER WHEELS.

● BY OTHER WHEELS WHAT IS MEANT IS FOR EXAMPLE A SPANNER MAKES IT EASY TO UNDO A NUT OR A CAR JACK MAKES IT EASY TO LIFT A CAR.

SPANNER UNDOING A NUT

HOW IS THE ENRGY IN THIS MEASURED?

THERE ARE MANY TYPES & SHAPES OF SPANNER.

THESE ARE SPANNER HEADS & BITS.

CAR JACK LIFTING A CAR

DIFFERENT TYPES OF CAR JACK.