pulleys,gears&other wheels
TRANSCRIPT
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.