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Dynamics-Notes-Physics-11
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Dynamics-Notes-Physics-11
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BITE HETTIEDYNAMICS IS THE STUDY OF
FORCES
A FORCE IS A PUSH OR PULL
FORCE IS A VECTOR
S UNIT NEWTON I 1
TYPES OF FORCES
CONTACT FORCES TOUCHING
APPLIED FORCE Fa A FORCE USED
TO HELP MOVE AN OBJECT
EXAMPLE
PUSHING A Box
FORCE OF FRICTION E A FORCE
THAT OPPOSES SLIDING MOTION
BETWEEN SURFACES
NORMAL FORCE Fn THE FORCE
A SURFACE EXERTS ON AN
OBJECT TO SUPPORT IT THE
NORMAL FORCE ALWAYS ACTS
SERPENDCULAR TO THE SURFACE
, TENSION FT THE PULL EXERTED
BY A STRING ROPE OR CABLE
SPRING FORCE Fs THE FORCE A
SPRING EXERTS TO RESTORE IT TO
ITS NORMAL SHAPE
AT A DISTANCE FORCES NOT
TOUCHING
GRAVITATIONAL FORCE AKA
WEIGHT Fs THE ATTRACTION
BETWEEN TWO OBJECTS
GENERALLY EARTH AND AN OBJECT
Fg mg Fg GRAVITATIONAL
FORCE 1 I
m MASSI g
g GRAVITATIONAL
FIELD STRENGTH
9.8
ELECTROSTATIC FORCE
MAGNETIC FORCE
, FREE BODY DIAGRAMS
A FREE BODY DIAGRAM IS USED TO
SHOW THE MAGNITUDE AND
DIRECTION OF ALL THE FORCES
ACTING ON AN OBJECT
USE A DOT OR BOX TO REPRESENT
THE OBJECT
USE ARROWS TO REPRESENT THE
FORCES
ARROWS POINT OUTWARDS FROM
THE OBJECT
THE LENGTH OF AN ARROW SHOWS
THE SIZE OF THE FORCE
FORCES MUST BE LABELLED
IF YOU ARE UNSURE OF WHAT FORCES ARE ACTING
ON AN OBJECT A ROUGH RULE IS EVERYTHING
TOUCHING THE OBJECT PLUS GRAVITY
EXAMPLE
DRAW A FREE BODY DIAGRAM FOR THE
FOLLOWING SITUATIONS
a A BOOK A REST ON A TABLE
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