6 3 elastic and inelastic collisions
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6.3 Elastic and Inelastic Collisions. Date, Section, Pages, etc. Mr. Richter. Agenda. Today: Warm Up Review HW from 7.1 Practice Problems for 7.2 Intro to Collisions (7.3) Tomorrow Conservation of Momentum Lab Thursday: Review HW from 7.2 Finish Collisions (7.3) Friday:

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6.3 Elastic and Inelastic Collisions

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6 3 elastic and inelastic collisions

6.3 Elastic and Inelastic Collisions

Date, Section, Pages, etc.

Mr. Richter


Agenda

Agenda

  • Today:

    • Warm Up

    • Review HW from 7.1

    • Practice Problems for 7.2

    • Intro to Collisions (7.3)

  • Tomorrow

    • Conservation of Momentum Lab

  • Thursday:

    • Review HW from 7.2

    • Finish Collisions (7.3)

  • Friday:

    • Problem Solving Practice

  • Monday:

    • Concepts Review

  • Tuesday

    • Chapter 6 Test


Warm up

Warm-Up:

  • Assume two cars have the same mass and speed going into a collision.

    • Scenario A: Two cars collide with each other but bounce off. Neither of them sustain noticeable damage.

    • Scenario B: Two cars collide with each other and crumple, sticking together after the crash.

  • In which scenario do you think energy is conserved?

  • In which scenario do you think the driver feels more force?


Conservation of momentum

Conservation of Momentum

Practice Problems


Practice problems

Practice Problems

  • Recoil: A boy on a skateboard initially at rest tosses an 8.0 kg jug of water in the forward direction at a speed of 3.0 m/s. If the boy and the skateboard move backward at 0.60 m/s, find the mass of the boy.

  • Collision: p. 234 #39

    • As long as everything is in grams (g) and centimeters per second (cm/s), THERE IS NO NEED TO CONVERT.


Agenda1

Agenda

  • Review HW from 6.2

  • Recap Elastic and Inelastic Collisions

  • Problem Solving with Elastic and Inelastic Collisions

  • Forces in Elastic and Inelastic Collisions


Objectives

Objectives

  • Identify different types of collisions.

  • Calculate change in kinetic energy (or lack thereof) in different types of collisions.

  • Find the final velocity of objects in different types of collisions.

  • Understand the relationship between the type of collision and the force experienced by the object.


Elastic collisions

Elastic Collisions


Collisions

Collisions

  • Collisions can be categorized into two types:

    • elastic

    • inelastic

  • Elastic collisions are when objects bounce off of each other.

    • (Elastics are like rubber bands, and rubber bounces)

    • Scenario A.

  • Inelastic collisions are when objects stick together after the crash.

    • Scenario B.


Elastic collisions1

Elastic Collisions

  • In perfectly elastic collisions objects:

    • Bounce off each other

    • No loss of energy due to speed (kinetic energy)

    • No change of shape.

  • In real life, there are almost no perfectly elastic collisions.

    • Almost always, some energy is lost to sound or heat in a collision.


Elastic collisions awesome examples

Elastic Collisions: Awesome Examples


Elastic collisions problem solving

Elastic Collisions: Problem Solving

  • Both momentum and kinetic energy are conserved in perfectly elastic collisions. Masses separate afterward.


Practice problem

Practice Problem


Inelastic collisions

Inelastic Collisions


Inelastic collisions1

Inelastic Collisions

  • In inelastic collisions objects:

    • Stay stuck together

    • Kineticenergy is lost to:

      • Primarily internal energy

      • Heat

      • Sound

    • Objects are deformed (shape is changed.

  • In real life, most collisions are a combination of elastic and inelastic collisions. Objects will deform a little, and separate a little.


Inelastic collisions awesome example

Inelastic Collisions: Awesome Example


Inelastic collisions problem solving

Inelastic Collisions: Problem Solving

  • Only momentum is conserved in inelastic collisions. Kinetic energy is lost. Masses stick together afterward.


Practice problem1

Practice Problem


Forces in collisions

Forces in Collisions


Forces in collisions1

Forces in Collisions

  • Assume two objects that have the same mass and the same speed collide with each other.

  • In which type of collision do they experience a greater change in momentum?

    • inelastic (both vehicles stop)

    • elastic (both vehicles stop and reverse direction)

  • Elastic collisions have greater changes in speed, thus the objects experience more force!


Forces in collisions examples

Forces in Collisions: Examples

  • Think of a batter in baseball. Does the baseball experience more force when the batter:

    • bunts (inelastic)

    • hits a home run (elastic)

  • Your car is designed to crumple (inelastic), so that you experience less force.

  • Greater changes in momentum mean more force. Elastic collisions are more forceful!


Wrap up did we meet our objectives

Wrap-Up: Did we meet our objectives?

  • Identify different types of collisions.

  • Calculate change in kinetic energy (or lack thereof) in different types of collisions.

  • Find the final velocity of objects in different types of collisions.

  • Understand the relationship between the type of collision and the force experienced by the object.


Homework

Homework

  • p. 230 #1-5


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