CH 2: Conservation of momentum and elastic and inelastic collisions
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Questions and Answers

What is the definition of a system in physics?

  • The net external forces acting on a system
  • The forces acting on an object
  • The collection of objects being analyzed (correct)
  • The environment surrounding the objects being analyzed

    • Which type of forces are forces between objects within the system?

  • External forces
  • Gravitational forces
  • Internal forces (correct)
  • Net forces

    • What is an isolated system in physics?

  • A system with zero external forces (correct)
  • A system where only gravitational forces act
  • A system that is not affected by momentum
  • A system with zero internal forces

    • Which principle states that the total linear momentum of an isolated system remains constant?

    <p>Conservation of linear momentum principle</p> Signup and view all the answers

    What does applying conservation of linear momentum involve in a one-dimensional head-on collision scenario?

    <p>Assigning a positive direction and considering momentum contributions</p> Signup and view all the answers

    In elastic collisions, which quantities are conserved?

    <p>Both momentum and kinetic energy</p> Signup and view all the answers

    Which type of collisions involve conservation of kinetic energy?

    <p>Elastic collisions</p> Signup and view all the answers

    Which of the following is true for elastic collisions?

    <p>The total kinetic energy of the system is conserved</p> Signup and view all the answers

    In an inelastic collision, which of the following is conserved?

    <p>Momentum</p> Signup and view all the answers

    Which step is NOT part of the collision analysis process described?

    <p>Calculate the change in potential energy</p> Signup and view all the answers

    In a vehicle collision, analyzing momentum can help understand:

    <p>Both A and B</p> Signup and view all the answers

    What is the purpose of safety features like crumple zones and airbags in vehicles?

    <p>Both A and C</p> Signup and view all the answers

    In the worked example of a vehicle collision, what principle is applied to find the combined velocity after the collision?

    <p>Conservation of momentum</p> Signup and view all the answers

    In the bullet and block scenario, what type of collision is illustrated?

    <p>Inelastic collision</p> Signup and view all the answers

    After the inelastic collision in the bullet and block scenario, what principle is further exemplified by the block-bullet system's movement against friction?

    <p>Conservation of energy</p> Signup and view all the answers

    Which statement is NOT true about the principles discussed in the text?

    <p>Momentum is always conserved, regardless of collision type</p> Signup and view all the answers

    What is the primary difference between elastic and inelastic collisions, according to the text?

    <p>Kinetic energy is conserved in elastic collisions but not in inelastic collisions</p> Signup and view all the answers

    What is the primary difference between internal and external forces within a system?

    <p>Internal forces act between objects within the system, while external forces come from outside the system.</p> Signup and view all the answers

    In physics, what type of system is characterized by zero net external forces?

    <p>Isolated system</p> Signup and view all the answers

    What is the main principle behind the conservation of linear momentum in physics?

    <p>Total linear momentum of an isolated system is constant with zero net external force</p> Signup and view all the answers

    In a head-on collision scenario along a straight path, what is a key consideration when applying the conservation of linear momentum?

    <p>Considering momentum contributions before and after collision</p> Signup and view all the answers

    What distinguishes elastic collisions from inelastic collisions in terms of energy conservation?

    <p>Elastic collisions conserve both momentum and kinetic energy.</p> Signup and view all the answers

    Which type of collision involves conservation of both momentum and kinetic energy?

    <p>Elastic collision</p> Signup and view all the answers

    What happens to the total linear momentum of an isolated system if there are no net external forces acting?

    <p>It remains constant</p> Signup and view all the answers

    What role does friction play in determining whether a collision is elastic or inelastic?

    <p>Friction can cause an elastic collision to become inelastic</p> Signup and view all the answers

    When analyzing a collision, what aspect does conservation of linear momentum focus on?

    <p>Velocity changes before and after the collision</p> Signup and view all the answers

    What effect does applying conservation of linear momentum have on understanding one-dimensional head-on collisions?

    <p>It simplifies analysis by only considering pre-collision velocities</p> Signup and view all the answers

    In an inelastic collision, what happens to the kinetic energy of the system?

    <p>It is partially converted into other forms of energy.</p> Signup and view all the answers

    What is the primary purpose of calculating the total kinetic energy before and after a collision?

    <p>To determine the type of collision (elastic or inelastic).</p> Signup and view all the answers

    In the worked example of the vehicle collision, if the total kinetic energy before the collision is greater than the total kinetic energy after the collision, what type of collision is it?

    <p>Inelastic</p> Signup and view all the answers

    What principle explains the effectiveness of crumple zones and airbags in reducing the severity of injuries in vehicle collisions?

    <p>Impulse-momentum theorem</p> Signup and view all the answers

    In the bullet and block scenario, which principle is exemplified by the block-bullet system's movement against friction after the initial inelastic collision?

    <p>Work-energy principle</p> Signup and view all the answers

    In a perfectly elastic collision, what happens to the total kinetic energy of the system?

    <p>It is completely conserved.</p> Signup and view all the answers

    What is the primary difference between elastic and inelastic collisions in terms of energy conservation?

    <p>Kinetic energy is conserved in elastic collisions, but not in inelastic collisions.</p> Signup and view all the answers

    In a one-dimensional head-on collision between two objects, applying the principle of conservation of linear momentum involves:

    <p>Equating the sum of initial momenta to the sum of final momenta.</p> Signup and view all the answers

    Which of the following statements is true about the total kinetic energy of a system in an elastic collision?

    <p>It remains the same before and after the collision.</p> Signup and view all the answers

    Which of the following is NOT a step in the collision analysis process described in the text?

    <p>Calculate the total momentum before the collision.</p> Signup and view all the answers

    What property remains conserved in both elastic and inelastic collisions?

    <p>Momentum</p> Signup and view all the answers

    In the context of collisions, if the total kinetic energy before and after a collision is not equal, what aspect does this indicate?

    <p>Energy Transformation</p> Signup and view all the answers

    What is the main purpose of calculating the total kinetic energy before and after a collision?

    <p>Determine the Collision Type</p> Signup and view all the answers

    In a vehicle collision where crumple zones and airbags are employed, what aspect helps mitigate injury severity?

    <p>Collision Duration Extension</p> Signup and view all the answers

    What principle is further exemplified by the block-bullet system's movement against friction post-inelastic collision in the bullet and block scenario?

    <p>Energy Dissipation</p> Signup and view all the answers

    When analyzing real-world events like car accidents or sports, understanding the conservation of momentum assists in comprehending what aspect of the systems involved?

    <p>Dynamic Interactions</p> Signup and view all the answers

    What allows for a deeper understanding of physical systems and plays a crucial role in developing safety measures for various applications?

    <p>Principles of Conservation of Momentum</p> Signup and view all the answers

    What does analyzing momentum in a head-on collision primarily assist in determining?

    <p>Collision Type Classification</p> Signup and view all the answers

    What is a key consideration when applying the conservation of linear momentum in a head-on collision scenario?

    <p>Momentum Vector Summation</p> Signup and view all the answers

    What principle aids in reducing injury risk through lower impact forces by extending collision duration in vehicle safety features?

    <p>Impulse-Momentum Theorem</p> Signup and view all the answers

    In an isolated system, what happens to the total linear momentum if there are no external forces acting on the system?

    <p>It is conserved and remains constant.</p> Signup and view all the answers

    In a perfectly inelastic collision between two objects, which quantity is conserved?

    <p>Linear momentum</p> Signup and view all the answers

    If the total kinetic energy of a system before a collision is greater than the total kinetic energy after the collision, what type of collision has occurred?

    <p>Inelastic collision</p> Signup and view all the answers

    In a one-dimensional, head-on collision scenario, what is a key consideration when applying the conservation of linear momentum?

    <p>Assigning a positive direction and considering the momentum contributions of all objects before and after the collision.</p> Signup and view all the answers

    What is the primary purpose of safety features like crumple zones and airbags in vehicles during collisions?

    <p>To convert kinetic energy into other forms of energy, reducing the impact on occupants.</p> Signup and view all the answers

    In a perfectly elastic collision between two objects, what happens to the total kinetic energy of the system?

    <p>It is conserved and remains constant.</p> Signup and view all the answers

    Which type of collision involves the conservation of both linear momentum and kinetic energy?

    <p>Elastic collision</p> Signup and view all the answers

    If the total kinetic energy of a system before a collision is equal to the total kinetic energy after the collision, what type of collision has occurred?

    <p>Perfectly elastic collision</p> Signup and view all the answers

    In the context of analyzing collisions, what is the primary role of the principle of conservation of linear momentum?

    <p>To determine the final velocities of the objects involved.</p> Signup and view all the answers

    In an inelastic collision between two objects, what happens to the kinetic energy of the system?

    <p>It decreases due to energy dissipation.</p> Signup and view all the answers

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