petunjuk memahami konsep dasar momentumFull description
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Descripción: momentum angular, inercia rotacional, momentos de inercia y conservacion del momentum angular
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petunjuk memahami konsep dasar momentumDeskripsi lengkap
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Descripción: filo 3
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Descripción: Problema N°25 - ejercicio desarrollado - mecánica de fluidos I
unit 25
Descripción: ff
FisikiaFull description
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OBJECTIVES • Define momentum of an object • Define momentum as the product of mass and velocity • State the principle of conservation of momentum • Describe applications of conservation of momentum • Solve problems involving momentum
Why???????
Why did the revolver recoil after it was fired?
MOMENTUM • Momentum is defined as the product of mass and velocity. • Momentum is a vector quantity. It has both magnitude and direction. The SI unit of momentum is kgms-1
m s-1
kg
• The direction of a momentum of an object is the same as the direction of the velocity of the object. • If an object moving to the right denotes a positive velocity, the left direction will denote a negative velocity.
Conservation of Momentum • The principle of conservation of momentum states that in a collision, the total momentum of the object before the collision is equal to the total momentum after the collision, provided that there is no external force acting on the colliding objects
P (before collision) = P (after collision) m1v1 = m2v2
Elastic Collision • An elastic collision is a collision where the two colliding objects separate after colliding. • Momentum is conserved in elastic collision.
P (before collision) = P (after collision) m1u1 + m2u2 = m1v1 + m2v2
Inelastic Collision • An inelastic collision is a collision where the two colliding objects stick together after colliding. • Momentum is conserved in an inelastic collision
Exercise 1. A bullet of mass 20 g is fired towards a stationary target with a mass of 2 kg. The bullet is embedded in the target and both move together at a common velocity of 2 m s-1. Find the velocity of the bullet before hitting the target.
2. A car of mass 1 200 kg was involved in a head on collision with a lorry of mass 4 800 kg travelling at 79.2 km h-1 . After the collision, the car and the lorry were locked together and continued moving at a velocity of 21.6 km h-1. Find the velocity of the car before collision.
3. A bullet of mass 10 g was fired from a 4 kg rifle with a velocity of 200 m s-1. Find the recoil velocity of the rifle.