IWP Applets for Chapter 9

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G9-2 Guide to Solving Conservation of Momentum Problems, Part 2

collision-inelastic-2d-01.iwp

collision-inelastic-2d-01.iwp

UNC and NCSU football players undergo a compeletely inelastic collision in 2 dimensions. The vectors represent the initial and final momenta. Verify by doing a conservation of momentum problem that the magnitude and direction of the final velocity of the players is correct as given under Outputs. Of course, friction would bring the players to a stop much quicker than is shown here.

P12b

Conservation of Momentum

collision-inelastic-2d-02.iwp

collision-inelastic-2d-02.iwp

UNC and NCSU football players undergo a compeletely inelastic collision in 2 dimensions. The vectors represent the initial and final momenta. Determine the magnitude and direction of the velocity of the combined players. Of course, friction would bring the players to a stop much quicker than is shown here.

P12b

Conservation of Momentum

collision-bullet-block-02.iwp

collision-bullet-block-02.iwp

A bullet is fired horizontally at high speed toward a block of wood resting on a very long table. The bullet embeds in the wood. Kinetic friction between the table and the block brings the block to a stop. The distance that the block slides is given as an output. Determine the velocity of the bullet before the collision.

P12b

Conservation of Momentum

collision-bullet-block-03.iwp

collision-bullet-block-03.iwp

A bullet is fired horizontally at high speed toward a block of wood resting on a table. The bullet is slowed through the block and exits on the opposite side. Kinetic friction between the table and the block brings the block to a stop. The distance that the block slides is given as an output. Determine the velocity of the bullet after passing through the block.

M05b

Elastic Collisions

collision-symmetric.iwp

collision-symmetric.iwp

Two gliders of equal mass collide in an elastic collision. Play the animation. Click Show Graph. The velocities of the two objects will be displayed as a function of time. Try collisions for different pairs of initial velocities. After a while, you should be able to predict the final velocities, given any pair of initial velocities.

M05b

Elastic Collisions

collision-elastic-2.iwp

collision-elastic-2.iwp

Two gliders collide in an elastic collision. The red glider is initially stationary. The x-coordinate of the center of mass of the system of gliders is shown as a black dot. Play the animation. Click Show Graph. The velocities of the two objects and of the center of mass will be displayed as a function of time. Try collisions for different values of mass and initial velocity. After a while, you should be able to predict the final velocities, given any pair of initial velocities.

V08Bv2

APB-08-V08Bt

happy-sad-02.iwp

happy-sad-02.iwp

A pendulum bob is released from rest. At the bottom of its path, the bob strikes a block.

E.09.01v2

APB-09-01-13

auto-impulse-3.iwp

auto-impulse-3.iwp

A car and its unseatbelted crash test dummy accelerates uniformly from rest toward an immovable wall. The car bounces off the wall and then decelerates uniformly to a stop.

Click Show Graph to display a graph of the velocity of the car vs. time.

E.09.02

APB-09-02-01

collision-01.iwp

collision-01.iwp

Two objects collide and rebound from each other. The momentum vector of each object as well as the sum of the momentum vectors is displayed. The lengths of the vectors are drawn to the same scale.

Unphysical results may be obtained for combinations of initial velocities for which the objects cannot collide.

E.09.02

APB-09-02-02

collision-02b.iwp

collision-02b.iwp

Two objects collide and stick together.

E.09.02

APB-09-02-02

collision-02.iwp

collision-02.iwp

Two objects collide and stick together. The momentum vector of each object as well as the sum of the momentum vectors is displayed. The lengths of the vectors are drawn to the same scale.

Unphysical results may be obtained for combinations of initial velocities for which the objects cannot collide.

E.09.02

APB-09-02-03

collision-03.iwp

collision-03.iwp

Two objects collide and stick together. The momentum vector of each object as well as the sum of the momentum vectors is displayed. The lengths of the vectors are drawn to the same scale.

Unphysical results may be obtained for combinations of initial velocities for which the objects cannot collide.

E.09.02

APB-09-02-04

collision-explosion-02.iwp

collision-explosion-02.iwp

Two objects are initially at rest. A spring-loaded plunger attached to the red block is quickly released, and the blocks push each other apart.

E.09.02

APB-09-02-05

collision-04.iwp

collision-04.iwp

Two objects collide. The momentum vector of each object as well as the sum of the momentum vectors is displayed. The lengths of the vectors are drawn relative to the magnitude of the momentum. The total kinetic energy of the system of two objects is represented by the orange bar.

The coefficient of restitution may have values from 0 to 1. This parameter adjusts the degree of elasticity of the collision.

Unphysical results may be obtained for combinations of initial velocities for which the objects cannot collide.

E.09.03v2

APB-09-03-01t

collision-elastic-2d-01.iwp

collision-elastic-2d-01.iwp

A green ball makes a glancing elastic collision with an initially stationary red ball. The balls have equal mass. The paths of the balls after the collision are perpendicular. The vectors shown represent momenta.