Chapter-7 Momentum and Impulse - Winthrop Chemistry

Chapter-7 Momentum and Impulse - Winthrop Chemistry

Chapter-7 Momentum and Impulse 1 Momentum 2 Impulse 3 Conservation of Momentum 4 Recoil 5 Elastic and Inelastic Collisions 6 Collisions at an Angle: An Automobile Collision Momentum, p

In everyday life, the word momentum is used to describe changes in the flow of a game or leads in elections. In physics, the momentum p of an object is the product of the objects mass m and velocity v: Momentum = Mass x Velocity Momentum is a vector quantity that points in the same direction as the velocity. SI Unit of Linear Momentum: kilogram meter/second = (kg m/s)

A bowling ball and a tennis ball with the same momentum Q: If the velocity of an object is doubled, its momentum is multiplied by____________ its kinetic energy is multiplied by ___________ a.1 b. 2

c. 3 d. 4 e. 8 Impulse, J The impulse J of a force is the product of the average force and the time interval t during which the force acts: Impulse is a vector quantity and has the same direction as the average force.

SI Unit of Impulse: newton second = (N s) Impulse = Change in momentum Momentum and Impulse A tennis ball bouncing off the floor. There is a rapid change in the direction of the velocity when the ball hits the floor. The floor

delivers the impulse to the tennis ball. Baseball Q: Why batters swing when they hit a ball? A: To increase the time of contact

Catching an Egg Q: An egg is thrown at you. How can you catch it without breaking it? Conservation of Momentum The principle of conservation of momentum helps us understand collisions such as above. The total momentum of an isolated system remains constant (is

conserved). Isolated means there are no net external forces. Demo: Try this box 7.2 Recoil and Rocket Motion Q: Why does a shot gun slam against your shoulder when

fired? Q: How can a rocket accelerate in empty space? Starting from rest, two skaters push off against each other on smooth level ice, where friction is negligible. The mothers mass is 100 kg and the childs is 50 kg. If the

mother moves away with a velocity of 2.5 m/s, west, find the recoil velocity of the child. Two Skaters Push off Collisions are often classified depending on how the total kinetic energy changes during the collision:

Collisions 1. Elastic collisionOne in which the total kinetic energy of the system after the collision is equal to the total kinetic energy before the collision. 2. Inelastic collisionOne in which the total kinetic energy of the system is not the same before and after the collision. 3. Partially inelastic collision is one in which some

energy is lost, but the objects do not stick together after the collision. 4. Perfectly inelastic collision is one in which the objects stick together after the collision. A greatest portion of energy is lost here. Collision Problems in One Dimension 1. A freight car rolling down the track at 3 m / s collides with four identical freight cars that were initially at rest. Calculate the speed of the coupled cars after the collision.

2. A 2000 kg car collides with a 1500 kg car that was initially at rest. The two cars lock together and move off after the collision at a speed of 6 m / s. Calculate the speed of the 2000 kg car before the collision. 3. A football player of mass 100 kg with a speed of 3.0 m / s collides head-on with another football player of mass 85 kg who was initially moving in the opposite direction with a speed of 5.0 m / s. The second player tackles the first and they become entangled into the equivalent of a single mass. Determine the direction and the magnitude of the velocity of the two players after the collision.

Collisions at an Angle Automobile Collision: Analysis

Recently Viewed Presentations

  • Using SHRM As a Resource - Indiana University

    Using SHRM As a Resource - Indiana University

    For students or recent graduates, passing the exam is the first step toward becoming fully certified. Within five years of passing the exam, students must acquire two years of exempt-level HR experience. Individuals will then be designated a certified Professional...
  • The Cognition Hypothesis of Task-based Language Learning:

    The Cognition Hypothesis of Task-based Language Learning:

    Re-thinking for speaking, the Cognition Hypothesis, task classification and task sequencing Peter Robinson, Aoyama Gakuin University [email protected] The Cognition Hypothesis The fundamental pedagogic claim of the Cognition Hypothesis is that pedagogic tasks should be sequenced for learners in an order...
  • Essentials of Fire Fighting 6th Edition Firefighter I

    Essentials of Fire Fighting 6th Edition Firefighter I

    Number, location of staircases, elevator shafts, dumbwaiters, ducts, roof openings. External exposures. Connection to adjoining structures. Type, design of roof. ... There are two main types of tactical ventilation that can be performed. 13- ...
  • Climate Science - UCAR Center for Science Education

    Climate Science - UCAR Center for Science Education

    The oceans = shape climate by. storing and transporting heat and moisture. Ocean circulation = ocean water exchanges tremendous amounts. of heat with the . atmosphere, and ocean currents move energy . from place to place. Surface and deep ....
  • Lesson 3  pellucid abstemious archaic peremptory atelier perspicacious

    Lesson 3 pellucid abstemious archaic peremptory atelier perspicacious

    Lesson 3. abstemious. archaic. atelier. axiom. dulcet. expurgate. iniquity. patronizing. pellucid. peremptory. perspicacious. scapegoat. talisman. usurp. vacillate
  • Steps in accessing Past Papers

    Steps in accessing Past Papers

    7. Click on the back arrow to select another paper. Note: To do a new search, follow the steps above or type all: followed by the unit code in the search text box and press Enter key on the keyboard....
  • Schema Therapy

    Schema Therapy

    How Schemas Develop. Schemas originate through the interaction of child's innate temperament and early environment results in the frustration, rather than gratification of basic needs. Schemas that develop the earliest and are the strongest typically originate in the nuclear family....
  • Chapter 5

    Chapter 5

    Three ways of testing pH in professional products: nitrazine paper, pH pencil and the pH meter. pH range of 4.5 - 5.5 keeps hair, skin and nails closest to natural, healthy state. Salon Products and their pH Ranges. Product Information....