OCR AS PHYSICS

SIMPLE SUMMARY OF EACH CHAPTER

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  • Created by: Aimee
  • Created on: 07-04-11 20:19

DEFINITIONS

DISPLACEMENT

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DISPLACEMENT IS THE DISTANCE TRAVELLED IN A PARTICULAR DIRECTION.

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VELOCITY

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VELOCITY IS DEFINED BY THE EQUATION;

CHANGE IN DISPLACEMENT = VELOCITY MS-2

TIME TAKEN

THE GRADIENT OF A DISPLACEMENT/TIME GRAPH IS EQUAL TO VELOCITY

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SCALAR AND VECTOR QUANTITIES

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SCALAR QUANTITIE HAVE ONLY MAGNITUDE.

VECTOR QUANTITIES HAVE MAGNITUDE AND DIRECTION.

DISTANCE AND SPEED ARE SCALAR.

DISPLACEMENT AND VELOCITY ARE VECTORS.

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ACCELERATION

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ACCELERATION IS EQUAL TO THE RATE OF CHANGE IN VELOCITY.

IT IS A VECTOR QUANTITY.

THE GRADIENT OF A VELOCITY/TIME GRAPH IS EQUAL TO ACCELERATION.

THE AREA UNDER THE GRAPH IS EQUAL TO THE DISPLACEMENT.

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S.U.V.A.T

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V = U+AT

S = (U+V)    X 2

           2

S = UT + 1/2 AT2

V2 = U2 + 2AS

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DYNAMICS - EXPLAINING MOTION

NEWTONS 2nd  LAW.

WHAT IS A NEWTON?

MASS...

WEIGHT...

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NEWTONS SECOND LAW: NET FORCE f, MASS m AND ACCELERATION, a.

                                               f=ma

A NEWTON IS THE FORCE REQUIRED TO GIVE A MASS OF 1KG AN ACCELERATION OF 1MS IN THE DIRECTION OF THE FORCE.

MASS IS A MEASURE OF AN OBJECTS INERTIA...THE GREATER THE MASS, THE MORE IT RESISTS CHANGE IN MOTION.

WEIGHT OF AN OBJECT IS A RESULT OF THE PULL ON GRAVITY ON IT;

WEIGHT = MASS X ACCELERATION OF FREE FALL. ( W=mg)

               = MASS  X GRAVITATIONAL FIELD STRENGTH

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MOMENTS

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MOMENT OF A FORCE:

MOMENT = FORCE X PERPENDICULAR DISTANCE OF THE PIVOT THROUGH THE LINE OF ACTION OF THE FORCE.

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Comments

izzy

it would be nice if there weren't so many capital letters

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