BY PRACHI

GUPTA

Physics ppt

PARTS IN THE CHAPTER SPEED

MEASURING SPEEDTHE DISTANCE/TIME GRAPH

VELOCITY

SPEED SPEED

THERE ARE A NUMBER OF WAYS TO MEASURE SPEED SOME OF THEM

ARE;I. THE SPEEDOMETER

II. THE SPEED TRAP GUNIII.THE STOPWATCH

IV. LIGHT GATES

Measuring Speed

HAVE YOU EVER NOTICED THE FRONT OF THE CAR THERE IS A MACHINE

WHICH IS ATTACHED AND SHOWS THE SPEED OF AN YHE VEHICLE IS CALLED

THE SPEEDOMETER . CHARLES BABBAGE IS CREDITED WITH CREATING

AN EARLY TYPE OF A SPEEDOMETER, WHICH WERE USUALLY FITTED

TO LOCOMOTIVES.

THE SPEEDOMETER

A RADAR SPEED GUN (ALSO RADAR

GUN AND SPEED GUN) IS A DEVICE USED TO MEASURE

THE SPEED OF MOVING OBJECTS. IT IS USED IN LAW-

ENFORCEMENT TO MEASURE THE SPEED OF

MOVING VEHICLES AND IS OFTEN USED IN

PROFESSIONAL SPECTATOR SPORT, FOR SUCH THINGS AS THE MEASUREMENT OF

THE SPEED OF PITCHED BASEBALLS,

RUNNERS AND TENNIS SERVES.

THE SPEED TRAP GUN

Speed Trap Gun

A STOP WATCH   IS A HANDHELD TIMEPIECE DESIGNED TO

MEASURE THE AMOUNT OF TIME ELAPSED FROM A PARTICULAR TIME WHEN IT IS

ACTIVATED TO THE TIME WHEN THE PIECE IS DEACTIVATED. A LARGE DIGITAL VERSION OF A STOPWATCH DESIGNED FOR VIEWING AT A

DISTANCE, AS IN A SPORTS STADIUM, IS CALLED A STOPWATCH .

THE STOPWATCH

IN A LIGHT GATE A BEAM OF LIGHT SHINES

INTO A LIGHT SENSITIVE SWITCH. WHEN THE OBJECT

PASSES THE FIRST GATE A THE LIGHT GATE

STARTS AN ELECTRONIC STOP WATCH AND WHEN IT PASSES THE SECOND

GATE IT STOPS THE STOP WATCH AND THEN

THE TIME BETWEEN THE TWO LIGHT GATES IS

CALCULATED.

LIGHT GATES

A D I STA NCE T IM E G R A P H I S A V I SUA L R EP R ES ENTAT I ON O F

COL L ECT ED D ATA . TH E G R A P H H A S A H O R IZ ON TA L X A XI S WH I CH R E P R ESENT S T I M E

A ND A V E RT I CA L Y A X IS TH AT R EP R ESE NTS T H E D I STA NCE .

W H EN T H E L I NE ON T H E G R A P H I S H O RI Z ONTA L , T H E N I T IM P L I ES T H AT A N O B J ECT

I S STATI O NA RY A ND W H EN I T I S ST RA I G H T, B UT SL OP E D

TH E N TH E O B J ECT I S   M OV I NG   AT A ST E A D Y

SP EED.

THE DISTANCE/TIME GRAPH

VELOCITY I S THE R ATE OF

CHANGE OF THE POSI T ION OF AN

OB JECT, EQUI VALENT TO A SPEC IFI CATION

OF I TS SPEED AND DI RECTI ON OF

MOTION, E .G. 60 KM/H TO THE

NORTH.  

VELOCITY