Summary Newton's Laws - Physics IEB Grade 12

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, '




/ it ! 't
'




!
I
Ii :')
t to
g.
object continues of uniform unless it is acted by Fnet
an in a state rest
velocity upon 0
=
or


force ↳
a net or resultant equate equation to this .




when all forces on an object balance
•




object is
stationary
• →




→

moving with constant velocity



remember work with forces at calculate components ( backwards of adding to find Fnet)
angles
→
never
• •
:




FN is affected if FA is angle calculate
FAY
→
at an
•




example




with pulled with force of 90N of 50° to horizontal The box moves with
A box mass of
45kg ,
is at angle .
constant
velocity .




as FN
* 90N
-




Ay
50° consider
remember to equilibria nts
45kg
.




FAX
7




•
Fg
calculate FN

T.net = constant
velocity =O


(
Fnet on
y-axis Fnet =
FN t
FAY t
Fg )
-

:




O= FN t ( 905in 150 ) ) -

(9,8×45)

÷ FN =
372,06N




calculate coefficient of friction

fk=Mk . FN


FAX =
MKFN remember : friction = -
( FAX )

9005150 ) = Mk ( 372,06 )
Mk =
0,16




iner tia

to
f.⑧
inertia : the
property of an
object that causes it to resist a
change in its state of rest or uniform motion




object has inertia will not change its velocity unless net / resultant force acts it
→
on
•




increases with
increasing mass
•




↳ first law happens
why Newton 's