# OCR AS PHYSICS

SIMPLE SUMMARY OF EACH CHAPTER

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

## DEFINITIONS

DISPLACEMENT

1 of 14

DISPLACEMENT IS THE DISTANCE TRAVELLED IN A PARTICULAR DIRECTION.

2 of 14

VELOCITY

3 of 14

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

4 of 14

SCALAR AND VECTOR QUANTITIES

5 of 14

SCALAR QUANTITIE HAVE ONLY MAGNITUDE.

VECTOR QUANTITIES HAVE MAGNITUDE AND DIRECTION.

DISTANCE AND SPEED ARE SCALAR.

DISPLACEMENT AND VELOCITY ARE VECTORS.

6 of 14

ACCELERATION

7 of 14

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.

8 of 14

S.U.V.A.T

9 of 14

V = U+AT

S = (U+V)    X 2

2

S = UT + 1/2 AT2

V2 = U2 + 2AS

10 of 14

DYNAMICS - EXPLAINING MOTION

NEWTONS 2nd  LAW.

WHAT IS A NEWTON?

MASS...

WEIGHT...

11 of 14

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

12 of 14

MOMENTS

13 of 14

MOMENT OF A FORCE:

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

14 of 14