, Forces
·
force :
a push or a pull
-measured in N
-vector quantity ; has magnitude + direction
Types of Forces
1 .
Contact Force :
friction tension normal force
-
, ,
.
2 Non-Contact Force :
ac ts through space
magnetic force ; weight ; electrostatic
-
Weight Gravity
+
·
weight force
:
due to gravity ;
acts toward object centre
weight-mass- acceleration
fg m
g]
= .
2
9 8 m
.
.
s
·
If Fapplied =
Fg ; object is not moving/moving at constant velocity
·
If Fapplied [Fg ; object accelerates ↑
If Fapplied [Fg ; object accelerates &
·
Free Body Diagrams
object is not in diagram
·
·
consists of a dot wh arrows
include a key if writing in short hand
M
Eg horizontal plane Key
:
:
T
1) Fg weight
-
:
FN
-
⑨
a) FN :
normal force
S
3) Ff : friction
~
Ff
& ⑨ > FA
9) Fa : face applied (push)
Definitions
~
Fg
Force (Fri) force exerted surface
normal I
by
· :
Eg 2: inclined plane
·
weight (Fg)
:
Force due to gravity
·
Friction (FF) :
Force that opposes on objects motion ; 11 to surface
rFN
heavy object = ↑ friction
tension (T) :
Force coming from connector Crope cable)
·
⑲ ,
Ff
L
-Eg
·
force :
a push or a pull
-measured in N
-vector quantity ; has magnitude + direction
Types of Forces
1 .
Contact Force :
friction tension normal force
-
, ,
.
2 Non-Contact Force :
ac ts through space
magnetic force ; weight ; electrostatic
-
Weight Gravity
+
·
weight force
:
due to gravity ;
acts toward object centre
weight-mass- acceleration
fg m
g]
= .
2
9 8 m
.
.
s
·
If Fapplied =
Fg ; object is not moving/moving at constant velocity
·
If Fapplied [Fg ; object accelerates ↑
If Fapplied [Fg ; object accelerates &
·
Free Body Diagrams
object is not in diagram
·
·
consists of a dot wh arrows
include a key if writing in short hand
M
Eg horizontal plane Key
:
:
T
1) Fg weight
-
:
FN
-
⑨
a) FN :
normal force
S
3) Ff : friction
~
Ff
& ⑨ > FA
9) Fa : face applied (push)
Definitions
~
Fg
Force (Fri) force exerted surface
normal I
by
· :
Eg 2: inclined plane
·
weight (Fg)
:
Force due to gravity
·
Friction (FF) :
Force that opposes on objects motion ; 11 to surface
rFN
heavy object = ↑ friction
tension (T) :
Force coming from connector Crope cable)
·
⑲ ,
Ff
L
-Eg
