Class notes physics Physics : Textbook For Class Xi
Class notes physics Physics : Textbook For Class Xi
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INERTIA NEWTON‛S THIRD LAW Inclined Forces
A body cannot change its state of rest or -To every action, there is always an equal PULLEY
Fsin
If, Fsinθ <Mg
uniform motion along a straight line. This (in magnitude ) and opposite (in direction) reaction. N a
F block remains in Ideal
property is called inertia.Inertia has no - Forces in nature always occurs in pairs. contact with ground
unit and no dimension. M1 > M2
- A single isolated force is not possible. Fcos
M
If, Fsinθ =Mg F
INERTIA - Counter force experienced by a body- reaction a=
block just leaves M
- Action and reaction never act on the same body Mg contact with ground 2M
If, Fsinθ >Mg T =
Inertia Inertia Inertia of * Force exerted on body A by body B (action ) M
the block leaves contact with ground and
of Rest of Motion Direction * force exerted on body B by body A (reaction)
it begins to accelerate.
- Inertia of Rest
Reaction A
INCLIN
Inability to change state of rest by itself. FAction= FReaction Case 1
MOTION OF CONNECTED BODIES
- Inertia of Motion
B
a M2g
Inability of a body to change its state of Action F1 > F2 a=
Normal Reaction M
uniform motion by itself. - Occurs when two surfaces are in contact with F1 - F2 = Ma
F2 M F1
- Inertia of Direction each other F = Ma
Inability of a body to change direction of Always perpendicular to the surface. Fnet
a= Case 2
motion by itself. M
N
N
Newton‛s Second Law N
M2
Fnet= Rate of change of linear momentum. N N|
Instantaneous Average N
Tension M2g
dp p pf-pi N|
F= Fav= =
dt t t
Restoring force developed
MOMENTUM T T F
when a longitudnal force is
P=mv applied on a body
-It is a vector quantity having direction
same as that of velocity
-Unit is kg m/s. Ideal Rope
T
*Massless
LIQUID JETS
*Tension is same everywhere T
Area=A
*Can support only elongation
u wall
*Cannot support compressive force
m *On compression it becomes slack. F
x *Tension always acts away from the object.
MOTION OF BLOCKS CONNECTED BY MASSLESS STRING
v=0
Pf-Pi mx0-mu -mu Rod
Fjet= = = =-ρAu2
Δt Δt Δt
T F T F
Fwall = ρAu2
When liquid jet bounce back Elongation Compressive
+ve can support both elongation and compression
THICK
u Non -ideal Rope Tension w
u -Weight = Mg [vertically down]
Fjet = -2ρAu2 -Normal reaction (N) = perpendicular to surface
-ve
-Tension = acts away from body
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