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Summary OCR A level Physics A 3.2 Forces in action £6.49   Add to cart
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Summary OCR A level Physics A 3.2 Forces in action
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Summary notes for topic 3.2 Forces in action covering force, mass, weight, acceleration, centre of mass, free body diagrams, drag, terminal velocity, moments, couples, torques, triangle of forces, density, pressure, upthrust and Archimedes’ principle. Notes contain definitions, highlighted key te...

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  • June 28, 2022
  • 8
  • 2021/2022
  • Summary

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3.2 Forces in
action

, Force ,
mass + acceleration

F- -
ma resultant
force , F , in newtons N ,



mass, m ,
in
kilograms Rg ,

acceleration ,
a ,
in metres per second
squared ,
Ms
-2




A resultant
force acting on an
object will cause the object
to accelerate in the direction of the resultant force
A force of 1 newton gives a
1kg mass an acceleration
of 1ms the direction
of the force
-2
in


Mass and weight
weight
measured
is
in
the
gravitational force acting
newtons
on the object and is



W W in newtons N
mg weight
=
, , ,



mass , m , in kilograms kg ,




kilogram Nkg
"
acceleration due to in newtons
gravity g ,
, per ,




centre of mass


The resultant
gravitational force on the object ( weight) will
act
through an
imaginary point called the centre of gravity ,


which coincides with its centre mass
of
.




To find centre of gravity
:




Make holes
along the edge of the object
•
.




• Insert a clamped pin through one of the holes
•
Allow the object to come to rest then hang ,
a pwmb line from
Draw line on the
the pin .
a
object where the pwmb line rests
•

Repeat with the other holes
The centre of is where the lines
•
gravity cross

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