Physics Notes - Chapter 1- Chapter 6

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Force
-Measured In Newton[n]
-Can Cause The Object To Move,Change Speed Or Direction.[Newton 1st Law]

Balance Forces


When The Forces Is Balanced There is No Resultant Force
-If It is not moving it will stay at rest
-if it is moving it will continue to move at constant speed.

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Unbalanced Force

It Will Cause
a)A Stationary Object To Move
b)A Moving Object to
-Stop Moving
-Change Direction
-Move Faster
-Slow Down

[Newton 2nd Law]
-Force=Mass X Acceleration

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Free-body Diagram
Newton Third Law Says:
For Every Action There Is Another Equal Opposite Reaction

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Friction



Friction Is Good As It Make Things Able To Move
But Friction Is Bad Because It Wear And Tear Thing

Reduce Friction By:
-Adding lubricant
-Adding Ball And Roller Bearing etc

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Mass
-Mass(kg) is a measure of the amount of substance in the object
-Weight(N) is the force of gravity acting upon that object

Weight = mass × acceleration due to gravity
W = mg

On Earth, acceleration of free fall
g = 10 m s−2
Mass measured by beam balance and electronic balance.
Weight is measured by spring balance.

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Inertia and Mass
-Inertia of an object is the reluctance of the object to change either its state or rest, or if it is moving, its motion in a straight line.
-Newton’s first law of motion states that a body continues in its state of rest or uniform motion in a straight line unless compelled by a force to do otherwise

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Density.

SI Unit=Kg m-3

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Moments
Moment=Force X Distance
Pivot is the turning poing also known as fulcrum.

Principle Of Moment



If The Object On The Right Is The Same As The Left,
-The Anticlockwise moment= Clockwise Moment

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Center Of Gravity
-IS A Point Where The Weight In The Object Seems To Act On


It Might Not Be In The Center.
-If The Mass In An Object Is Heavier at The Top,The Center Of Gravity Is Higher.

-If The Mass In An Object Is Heavier at The Bottom,The Center Of Gravity Is Lower.

-For Uniformed Object,The Center Of Gravity Is In The Center.

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Stability
There is 3 Kind Of Stability


There Are Two Ways To Make Something More Stable.
-Increase The Aase Area
-Lower The Center of Gravity By Adding Something Heavy To The Bottom.

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Pressure[Not Needed For NA]
-Is The Amount Of Force That Is Acting On A Unit Area Of The Object.

Pressure=Force/Area
SI Unit Pascals[Pa] Or Nm-2

Pressure Due To A Liquid Column=Height X Density X Gravity