09 linear momentum and collisions tủ tài liệu bách khoa
➤ Gửi thông báo lỗi ⚠️ Báo cáo tài liệu vi phạmNội dung chi tiết: 09 linear momentum and collisions tủ tài liệu bách khoa
09 linear momentum and collisions tủ tài liệu bách khoa
Airbags have saved countless lives by reducing the forces exerted on vehicle occupants during collisions. Ho>v can airbags change the force needed to 09 linear momentum and collisions tủ tài liệu bách khoa bring a person from a high speed to a complete stop? Why are they usually safer than seat belts alone7 iCtmtttvchapterLinear Momentum and CollisionsChapter Outline9.1Linear Momentum and Its Conservation9.2Impulse and Momentum9.3Collisions9.4Elastic and Inelastic Collisions in One Dimension9.5Two-Di 09 linear momentum and collisions tủ tài liệu bách khoamensional Collisions9.6The Center of Mass9.7Motion of a System of Particles9.8{Optional) Rocket Propulsion251252CHAPĨÍR 9 Lineal Momentum and Collisio09 linear momentum and collisions tủ tài liệu bách khoa
nsCl onsidcr what happens when a golf ball is struck by a club. The ball is given a very large initial velocity as a result of the collision: consequeAirbags have saved countless lives by reducing the forces exerted on vehicle occupants during collisions. Ho>v can airbags change the force needed to 09 linear momentum and collisions tủ tài liệu bách khoaacceleration over a very short time interval, the average force exerted on it during the collision is very great. According to Newton’s third law. the ball exerts on the club a reaction force that is equal in magnitude to and opposite in direction to the force exerted by the club on the ball. This r 09 linear momentum and collisions tủ tài liệu bách khoaeaction force causes the club to accelerate. Because the club is much more massive than the ball, however, the acceleration of the club is much less t09 linear momentum and collisions tủ tài liệu bách khoa
han the acceleration of the ball.One of the main objectives of this chapter is to enable you to understand and analyze such events. As a first step, wAirbags have saved countless lives by reducing the forces exerted on vehicle occupants during collisions. Ho>v can airbags change the force needed to 09 linear momentum and collisions tủ tài liệu bách khoalaws. For example, a very massive football player is often said to have a great deal of momentum as he runs down the field. A much less massive player, such as a halfback, can have equal or greater momentum if his speed is greater than that of the more massive player. This follows from the fact that 09 linear momentum and collisions tủ tài liệu bách khoa momentum is defined as the product of mass and velocity. The concept of momentum leads US to a second conservation law. that of conservation of momen09 linear momentum and collisions tủ tài liệu bách khoa
tum. This law is especially useful for treating problems that involve collisions between objects and for analyzing rocket propulsion. The concept of tAirbags have saved countless lives by reducing the forces exerted on vehicle occupants during collisions. Ho>v can airbags change the force needed to 09 linear momentum and collisions tủ tài liệu bách khoa of one representative particle located at the center of mass.Definition of linear momentum OÍ a particle9.1^ LINEAR MOMENTUM AND ITS CONSERVATIONIn the preceding two chapters we studied situations too complex to analyze easily with Newton's laws. In fact. Newton himself used a form of his second la 09 linear momentum and collisions tủ tài liệu bách khoaw slightly different from SF = ma (Eq. 5.2)—a form that is considerably easier to apply in complicated circumstances. Physicists use this form to stud09 linear momentum and collisions tủ tài liệu bách khoa
y everything from subatomic particles to rocket propulsion. In studying situations such as these, it is often useful to know both something about the Airbags have saved countless lives by reducing the forces exerted on vehicle occupants during collisions. Ho>v can airbags change the force needed to 09 linear momentum and collisions tủ tài liệu bách khoa moving with a velocity V is defined to Ise the product of the mass and velocity:p = «▼(9.1)Linear momentum is a vector quantity because it equals the product of a scalar 62 quantity tn and a vector quantity V. Its direction is along V, it has dimensionsML/T, and its SI unit is kg • m/s.If a particl 09 linear momentum and collisions tủ tài liệu bách khoae is moving in an arbitrary direction, p must have three components. and Equation 9.1 is equivalent to the component equationspx = mvx py = w»r\ pt =09 linear momentum and collisions tủ tài liệu bách khoa
mvt(9.2)As you can sec from its definition, the concept of momentum provides a quantitative distinction between heavy and light particles moving at thAirbags have saved countless lives by reducing the forces exerted on vehicle occupants during collisions. Ho>v can airbags change the force needed to 09 linear momentum and collisions tủ tài liệu bách khoaton called the product mv9. J lineor Momentum and Its Conservation253quantity of motion: this is perhaps a more graphic description than our present-day word momentum. which comes from the Latin word lor movement.Quick Quiz 9.1Two objects have equal kinetic energies. Him do the niagniliitles of thei 09 linear momentum and collisions tủ tài liệu bách khoar intunenla coin pate? (a) fl, < fly, (l>) fl, fly, (c) //, ?-• fly, (d) not enough infonnalioii Io lull.Using Newton’s second law of motion, we can r09 linear momentum and collisions tủ tài liệu bách khoa
elate lite lineal momentum of a panicle to the resultant force acting on the particle: The time rate of change of the linear momentum of a particle isAirbags have saved countless lives by reducing the forces exerted on vehicle occupants during collisions. Ho>v can airbags change the force needed to Airbags have saved countless lives by reducing the forces exerted on vehicle occupants during collisions. Ho>v can airbags change the force needed toGọi ngay
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