impuls and momentum
TRANSCRIPT
MOMENTUM IMPULSE COLLISIONMOMENTUM IMPULSE COLLISION
RESILIENCE PERFECT
RESILLIENCE PARTIALLY
RESILLIENCE NOT AT ALL
RESILIENCE PERFECT
RESILLIENCE PARTIALLY
RESILLIENCE NOT AT ALL
Basic Competencies
Learning Activities
indicator
Guide
Krisna SuryantiRSA1C314011
Assessment
Exercise
Momentum
Momentum is: the tendency of a moving object to continue moving at a constant speed, or the multiplication of mass with velocity object.formulated:P = m.v By: p = momentum (kg m / s)m = mass of the object (kg)v = velocity (m / s)
Basic Competencies
shows the relationship between the concept of impulse and momentum to solve the problem of collisions
LEARNING ACTIVITIES
• Discuss the concept of momentum, impulse, the relationship between impulse and momentum in class discussions• Experimenting law of conservation of momentum• Analyze the impact problem solving by using the law of conservation of momentum
indicator
• Formulating the concept of impulse and momentum, the relationship between them, and their application in life (eg rocket)• Formulate the law of conservation of momentum for a system without external forces• Integrating the law of conservation of energy and momentum conservation for many collision events
Guide
Physics books relevantMaterials: worksheets, student reports, presentation materialsTools: dynamic wagon, sled, tiker timers, media presentations
THE LAW OF CONSERVATION OF MOMENTUM
Two balls each having a mass m1 and m2, where m1 = m2. m1 m2 moving towards the stationary (v2 = 0). After the collision velocity turned into v1 'and v2'. When F12 is the style of m1 m2 used for mashing and F21 style of m2 used for mashing m1, then according to Newton's Third Law:
Total momentum of the object 1 and object 2 before and after the collision is equal / fixed. This law is called the Law of Conservation of Momentum.
What impulses relationship with Momentum?
One of Newton's law says that the force acting on an object is equal to the mass multiplication with the acceleration.
F = m.a.
If we enter into the formula I = F Δt
I = F. Δt
I = m.a (t2-t1)
I = m v / t (t2-t1)
I = m.v1 - mv2
"the magnitude of the impulse that works / worked on an object is equal to the change in the momentum of the object."
IMPULS
Impulse is defined as: the product of the force by the time required
by the force to moving .Impuls can be formulated:I = F. ∆ t
By: I = impulseF = force (N)Δt = time interval (s)
According to Newton's 2nd law:F = m aBy substituting the second equation is obtained
I = F Δt = mvt – mv0
with:MVt = momentum of the object, as the speed vtMV0 = mementum object when the velocity v0
Impulse as momentum changes
The concept of impulse and momentum changes can be viewed as a concept that arises from the application of Newton's second law , namely : (1.3)F ma
m
Play
Analisis Animasi
mF v1 m
v2
Animation : Stick provides a force ( F ) on the ball of mass ( m ) , then the ball velocity changes ( v = v1 - v2 ) in the interval ( t ) .
A change of pace on the object will give the average acceleration of :
2 1 (1.4)v v
at
The substitution of equation ( 1.4 ) to equation ( 1.3 ) , obtained
2 1
2 1 (1.5)
v vF m
t
F t m v v
Magnitude Ft called impulse , which means that the impulse is the change in momentum.
!Animasi
EXAMPLE
The working principle is the main rocket conservation of momentum . The number of rockets on the runway momentum equal to zero . When a rocket is launched , has sprayed down the burning of a high-speed jets of gas is made rocket moves upwards to compensate for the gas momentum .
The law of conservation of momentum on the rocket , namely :
Play
IND
ON
ES
IA
Animasi 9:
( ) ( )(1.15)R
mv mF v
t t
desain: bugishq blog
1 1 2 2
1 1 2 2
0 ' '
' ' (1.14)
m v m v
m v m v
Impulse is the change in momentum(F t = p= (mv)):So, force rockets is :
Collision
The collision was an event meets two moving objects. When the collision apply the law of conservation of momentum but not always apply the law of conservation of kinetic energy. Maybe some kinetic energy is converted into thermal energy due to the collision.
Collision
A collision occurs when a moving object on another object that is stationary or moving too . For example , a billiard ball collision or collision between two cars on the highway .
A B
Play
desain:bugishq blog
Animasi 4
The collision that occurs when the mass center point of the object toward the center of mass of the object point to another . As shown in the following animation .
amount of mechanical energy of the system ( objects that collide ) is not always fixed , likely after the collision energy turns into heat . However , the amount of momentum of the system is always fixed .
Perfectly elastic collision
Perfectly elastic collision is a collision between two objects remain the same amount of mechanical energy is great, just before and after the collision . In other words , perfectly elastic collision no energy is lost
Thus , the elastic perfectly valid : law of conservation of momentum law of conservation of mechanical energyFor example , two balls with the respective masses mA and mB , initially moving with velocity v1 and v2 . after the collision , the speed of the ball becomes v1 ' and v2 ' . Note animations
desain: bugishq blog
v1 v2
►Bola sebelum tumbukan
Play
►Bola saat tumbukan
v2’ v1’►Bola sesudah tumbukan
►Perhatikan animasinya
Animasi 5
collision resilient portion
In the collision elastic portion only applies the Law of Conservation Momentum , while the Energy Conservation Law does not apply , because the kinetic energy after the collision smaller objects before the collision . It is caused when there is no collision energy into heat or sound energy .
1. Apply the law of conservation of momentum ' '
1 1 2 2 1 1 2 2m v m v m v m v
Feature collision resilient portion :
2. Do not apply the law of conservation of mechanical energy
3. The coefficient of restitution ( e ) valued at between zero and one : 0 1e
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lantai
Play
Animasi :
RESILLIENCE NOT AT ALL
Elastic collision not at all characterized by:1.Applicable law of conservation of
momentum.2.Not applicable law of conservation of
kinetic energy.3.Restitution coefficient of zero
The collision between two objects with no resilience at all , then after the collision of the two bodies will have the same speed ( v'1 = v'2 = v ' ) , because the coefficient of restitution equal to zero ( e = 0 ) Note animation 8 !
' '1 1 2 2 1 1 2 2m v m v m v m v
In general, the impact resilience is not at all apply the law of conservation of momentum
Because the speed of the two objects after the collision the same , namely :
Then the law of conservation of momentum equation , becomes :
desain: bugishq blog
Play
Animasi :
1 2
v1 1 2v2
v'1 =v’2 =v’
' ' '1 2 (1.12)v v v
'1 1 2 2 1 2 (1.13)m v m v m m v