THIRD QUARTERPHYSICS

ARCHIE A. DURAN

WHAT TO EXPECT…

MODULE 1DESCRIBING

MOTION

MANY THINGS AROUND US MOVE,

SOME MOVE SLOWLY AND OTHERS MOVE QUICKLY

IN SCIENCE,

ENTAILS CAREFUL USE OF TERMS AND QUANTITATIVE

OBSERVATION

WHERE?

QUESTION THAT ANSWERS THE EXACT

POSITION OF THE OBJECT

WHERE?POINT OF REFERENCE

SOMETHING THAT SEEMS STEADY THAT IS USED TO

COMPARE THE POSITION OF AN OBJECT.

HOW TO DESCRIBE THE POSITION OF AN OBJECT?

•DESCRIBING HOW FAR THE OBJECT IS FROM THE POINT OF REFERENCE•DESCRIBING THE DIRECTION RELATIVE TO THE POINT OF REFERENCE

ACTIVITY 1:

WHERE IS IT?

INSTRUCTION:A. IT IS RIGHT THERE.B. TURN AND IT IS THERE.C. WALK SLOWLY AND YOU WILL GET THERE.D. IT IS FROM HERE TO THERE

THE OBJECT IS LOCATED UNDER THE TABLE.

THE OBJECT IS LOCATED ABOVE THE

REFRIGERATOR.

DESCRIBING THROUGH VISUALS

•WHAT IS THE POSITION OF THE DOG?•WHAT IS THE POSITION OF THE TREE?

•WHAT IS THE POSITION OF THE DOG WITH RESPECT TO THE HOUSE?

•WHAT IS THE POSITION OF THE TREE WITH RESPECT TO THE DOG?

HOW FAR?

•QUESTION THAT ANSWERS LENGTH.

1.GETTING THE TOTAL LENGTH OF THE PATH TRAVELLED BY THE OBJECT.

2.MEASURING THE DISTANCE BETWEEN THE INITIAL AND FINAL POSITION OF THE OBJECT.

DISTANCE VS. DISPLACEMENT •DISTANCE IS THE MEASUREMENT OF THE TOTAL LENGTH OF PATH TRAVELLED BY AN OBJECT

DISTANCE VS. DISPLACEMENT •DISPLACEMENT IS THE LENGTH OF PATH FROM THE INITIAL AND FINAL POSITION IN A STRAIGHT LINE.

WHEN CAN DISPLACEMENT BE EQUAL TO ZERO?

CAN DISPLACEMENT BE GREATER THAN

DISTANCE? WHY?

WHAT IF THE BALL, THE CAR, AND THE DOG IN THE ILLUSTRATION GO BACK TO THEIR STARTING

POSITIONS, WHAT WILL BE THEIR TOTAL DISTANCES? WHAT WILL

BE THEIR DISPLACEMENTS?

HOW FAST?

QUESTION THAT DESCRIBES HOW SLOW OR FAST AN

OBJECT IS MOVING.

THIS QUESTION CAN BE ANSWERED IN TWO WAYS:

SPEED & VELOCITY

ARE YOU FAMILIAR WITH THE SIGNS BELOW?

SPEED•BY KNOWING THE SPEED, WE CAN DETERMINEWHO/WHICH MOVES FASTER.THE TIME AT WHICH THE OBJECT REACH THE DESTINATION.

SPEED•SPEED IS DEFINED AS DISTANCE TRAVELLED DIVIDED BY THE TIME OF TRAVEL.

UNITS OF SPEED ARE…

•MILES/HOUR (MI/H)•KILOMETERS/HOUR (KM/H)•METERS/SECOND (M/S)

AVERAGE VS. INSTANTANEOUS SPEED

AVERAGE SPEED REPRESENTS THE SPEED

THROUGHOUT THE TRAVEL.

AVERAGE VS. INSTANTANEOUS SPEEDINSTANTANEOUS SPEED IS THE SPEED AT AN INSTANT.

SPEED AT A PARTICULAR TIME.

AVERAGE VS. INSTANTANEOUS SPEEDINSTANTANEOUS SPEED CAN BE

EQUAL, GREATER THAN, OR LESS THAN THE AVERAGE

SPEED.

SPEEDOMETER•A DEVICE USE TO MEASURE THE INSTANTANEOUS SPEED OF A VEHICLE.•IMPORTANT TO DRIVERS SO THEY WILL NOT EXCEED THE SPEED LIMIT.

SPEED & DIRECTION

SPEED WITH DIRECTION IS KNOWN AS VELOCITY

THINK…•AT CONSTANT DISTANCE, HOW IS SPEED RELATED TO RELATED TIME OF TRAVEL?•AT CONSTANT TIME OF TRAVEL, HOW IS SPEED RELATED TO THE DISTANCE TRAVELLED?

WHO WAS TRAVELLING FASTER THAN THE OTHER, A PERSON WHO COVERED 10 METERS IN 5 SECONDS OR THE ONE WHO TOOK

10 SECONDS TO COVER 20 METERS?

CHANGING SPEED AND DIRECTION

ACCELERATION

•IS THE CHANGE IN SPEED OR DIRECTION FOR A PERIOD OF TIME.

ACCELERATION

THERE IS…POSITIVE ACCELERATION - ACCELERATIONNEGATIVE ACCELERATION - DECELERATION

WHEN CAN WE CONSIDER AN OBJECT TO BE ACCELERATING?•WHEN THERE IS CHANGE IN SPEED•WHEN THERE IS CHANGE IN DIRECTION

LET’S SUMMARIZE…•IF AN OBJECT DOES NOT CHANGE ITS POSITION AT A GIVEN TIME INTERVAL, THEN IT IS AT REST OR ITS SPEED IS ZERO OR NOT ACCELERATING.

•IF AN OBJECT COVERS EQUAL DISTANCE AT EQUAL INTERVALS OF TIME, THEN IT IS MOVING AT CONSTANT SPEED AND STILL NOT ACCELERATING.

LET’S SUMMARIZE…

•IF AN OBJECT COVERS VARYING DISTANCES AT EQUAL INTERVALS OF TIME, THEN IT IS MOVING WITH CHANGING SPEED OR VELOCITY. IT MEANS THAT THE OBJECT IS ACCELERATING.

LET’S SUMMARIZE…

IN SCIENCE,

MOTION IS DEFINED AS THE CHANGE IN POSITION FOR A PARTICULAR TIME INTERVAL.

WE’RE DONE WITH

MODULE 1…