Physical Sciences Physics (Paper 1) Grade 11 year summary from Mind Action Series book for Curro Schools (IEB). Summarised according to SAGS document.
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1 Newton Force when
1kg lm Z
accelerates at
acting
: -
- s
Types of forces
Weight ( Fg) : Grau force .
exerted on
object
Fg =
mg
Force Normal ( Fn) Force surface
exerted
by object in contact
:
on
↳ Acts 90
°
Go surface
Friction Force ( Ff ) : Force that
opposes
the motion
Free
Body Diagrams
Shows all forces acting on
single isolated
body
Adding Forces
Forces SL to tf
acting in .
↳ Use t and -
bo show direction
-
R =
t 10
a.
Forces at 900
acting
↳ Draw add them
rectangle to
rt:* .
.
em A
Fz
:
ago
To Draw this
add Fi and Fz . . .
rectangle .. . Or this
triangle . . .
Or this triangle
::÷÷
, Finding Compo nets Of Forces
Objects On a
Slope
Weight divided into two components :
I .
Perpendicular to the slope (
Fyi) Equal
.
and opposite to normal force
2. Parallel to slope ( Fgz) acts down
slope .
Balanced
by friction
F-Down =
Toy Fy
-
Laws of Friction
•
Ffs motion when object
opposes is
stationary .
Fff
"
""
Ffs force when
equal obj s barbs Go
µ Fu
•
is to =
app . . move .
,
•
Ffk
opposes motion when object is
moving and equals bo
app .
force Ffk =
µkFN
, Chapter 3 Force :
and Motion M
Newton 's First Law
Object continues in a state of rest or constant
velocity
unless acted resultant force
upon by net or .
Inertia
Properly
its state
of
of
a
body
rest or
that causes
uniform motion
it to
.
resist
change in
Newton 's Second Law
When net force is
applied to object of mass ,
m
,
the
object accelerates in direction of net force .
Acceleration ,
proportional net force
a, is
directly to
,
and
inversely proportional
to mass .
Fnet -
-
ma
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