Summary Newtons Laws IEB Notes

-Newtons Laws- _




-Force-


Push
·

or pull
·

N

Contact
·


:




-

Tension

-

Friction

Non-contact
·




Gravity
-




Magnetic
-




Weight : The
gravitational force the earth excerts on
any object on or near it's surface




Eg = m
.




g


-Normal Force _ -




Perxindicular force exerted by a surface on an object in contact with it

Fu

FN



10kg
Eg
long To!
Fu =
Fg Eg
Vertical force down box
=
mg on




= 10(9 8) .
En =
Eg Fa(V) +
-
=
98Nup = 10(9 8) + 100sin30
.




= 148N




Newtons 1st Law : An object continues in a state of rest or uniform velocity unless it is acted upon by a net or



resultant force



-Eriction Force


Force that opposes the motion of an object -
g Friction ! Kinetic friction
Fts(max) =
Ms
. En
F I




Fts(mas) a maximum force of static friction Applied force


Ms - coefficient of static friction

Fr =
Uk Fr ·




FN - Normal force

FfH o Kinetic friction
Friction stationary object
·



on




ah a coefficient of Kinetic friction


·
Friction on
moving object