WHAT IS POSITION? LOCATION RELATIVE TO A REFERENCE POINT (FRAME OF REFERENCE)

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Presentation transcript:

WHAT IS POSITION?

LOCATION RELATIVE TO A REFERENCE POINT (FRAME OF REFERENCE)

WHAT IS MOTION?

CHANGE IN POSITION

WHAT IS THE DIFFERENCE BETWEEN A SCALAR QUANTITY AND A VECTOR QUANTITY?

A SCALAR QUANTITY CONSISTS OF JUST A MAGNITUDE AND A UNIT. A VECTOR QUANTITY CONSISTS OF A MAGNITUDE AND A UNIT AS WELL AS DIRECTION.

WHAT IS SPEED AND HOW IS IT CALCUALTED?

SPEED IS DISTANCE TRAVELED DIVIDED BY TIME. SPEED =  d /  t

WHAT IS VELOCITY?

SPEED PLUS DIRECTION

THE VELOCITY OF A CAR CHANGES FROM 0 m/s TO 9 m/s IN 3 seconds. WHAT IS ITS ACCELERATION.

Acceleration = a =  v /  t = (9 – 0)/3 a = 3 m/sec 2

DESCRIBE WHAT HAPPENS IN EACH STEP AND CALCULATE SPEED FOR EACH STEP. WHAT IS THE AVERAGE SPEED FOR THE TRIP.

WHAT IS GRAVITY, AND WHAT DOES IT DEPEND ON?

AN ATTRACTIVE FORCE BETWEEN TWO OBJECTS THAT DEPENDS ON THE PRODUCT OF THE MASSES OF THE TWO OBJECTS, AND IT IS INVERSELY PROPORTIONAL TO THE DISTANCE SQUARED.

IS GRAVITY ALWAYS POSITIVE?

YES

WHAT DO YOU CALL AN OBJECT THAT THE ONLY FORCE ACTING ON IT IS GRAVITY?

A PROJECTILE

IN EACH CASE, HOW DOES ACCELERATION CHANGE?

A – ACCELERATION IS DECREASING B – ACCELERATION IS INCREASING C – ACCELERATION IS ZERO D – ACCELERATION IS INCREASING, BUT NOT AS FAST AS B

WHAT IS FRICTION?

A FORCE RESISTING RELATIVE MOTION

NAME 3 KINDS OF FRICTION.

1)STATIC FRICTION 2)SLIDING FRICTION 3)ROLLING FRICTION 4)FLUID FRICTION

WHAT IS STATIC FRICTION?

THE AMOUNT OF FORCE NECESSARIY TO GET TWO SURFACES MOVING RELATIVE TO EACH OTHER

WHAT DOES SLIDING FRICTION DEPEND ON?

THE ROUGHNESS OF THE SURFACES THE AREA OF CONTACT THE FORCE NORMAL TO THE DIRECTION OF MOTION OF THE SURFACES ADHESION OF THE SURFACES

WHEN A PERSON DIETS, IS IT THEIR GOAL TO LOSE MASS OR TO LOSE WEIGHT?

MASS – MASS IS A MEASURE OF THE AMOUNT OF MATTER WEIGHT IS A MEASURE OF THE ATTRACTION DUE TO THE FORCE OF GRAVITY

WHAT IS THE DISTANCE AND DISPLACEMENT OF DRIVERS IN THE INDY 500 ROAD RACE?

THE DISTANCE DRIVEN IS 500 MILES. THE DISPLACEMENT IS ZERO, AS THEY FINISH RIGHT WHERE THEY START.

WHAT IS THE VELOCITY OF THE OBJECT IN THE GRAPH?

Velocity =  d/  t = (25-5)/(5-0) v = 20/5 = 4 m/s

DO ALL OBJECTS FALL AT THE SAME RATE?

ONLY IF YOU CAN IGNORE AIR RESISTANCE.