Friday, 12 July 2013 16:58

## C7-18 COLLISIONS OF BALLS - ASTROBLASTER

• ID Code: C7-18
• Purpose: Shows velocity multiplication in colliding balls
• Description:

This device has four balls of graduated masses on a central shaft. The smallest has a slightly larger opening so that it can come off the shaft, while the others are trapped in place. If the whole assembly is dropped from 50cm or so about the table, the smallest ball on the end will fly off with considerable velocity, potentially rising to significantly greater than the initial height.

Please be careful not to lose the small ball, and do not launch it into the audience or at anything else breakable.

##### Engagement Suggestion
• When presenting this device, describe it clearly, then encourage students to predict what will happen when you drop it.
• Afterwards, have them discuss the results.
##### Background

The total energy of the system, of course, cannot increase beyond what it gains from the potential energy of the height from which it is dropped. But the elastic collisions of each ball with a successively smaller and less massive one transfer significant kinetic energy. With the smaller mass of the final ball, it can have a higher velocity than the collection as a whole did.

• Availability: Available
• Loc codes: C7
• #### C7-01: AIR TRACK - ELASTIC COLLISIONS

Demonstrate conservation of energy and conservation of momentum in elastic collisions Read More
• #### C7-02: AIR TRACK -INELASTIC COLLISIONS

Demonstrate conservation of momentum in elastic collisions Read More
• #### C7-03: AIR TRACK - SCATTERING WITHOUT CONTACT

Show that elastic scattering can occur between two objects without actual physical contact between the objects Read More
• #### C7-04: AIR TRACK - COLLISION VELOCITY MULTIPLIER

Illustrate velocity multiplication with a three-to-one mass ratio collision Read More
• #### C7-11: COLLISIONS OF BALLS - EQUAL MASSES

Demonstrates conservation of energy and conservation of linear momentum in multiple elastic collisions Read More
• #### C7-12: COLLISION OF BALLS - ONE LIGHTER MASS

Show what happens when one mass in a collision ball set is different from the others Read More
• #### C7-13: COLLISIONS OF BALLS - GRADUATED MASSES

Demonstrate how the velocity is multiplied by a sequence of collisions between balls of decreasing mass Read More
• #### C7-14: COLLISIONS OF BALLS WITH FLOOR

Illustrate collisions of different balls with the floor Read More
• #### C7-15 COLLISIONS OF BALLS - 3 TO 1 MASS RATIO

Shows velocity multiplication in colliding balls Read More
• #### C7-16: HAPPY AND UNHAPPY BALLS

Illustrate coefficient of restitution Read More
• #### C7-17 SUPERBALL

Illustrates nearly elastic collisions Read More
• #### C7-18 COLLISIONS OF BALLS - ASTROBLASTER

Shows velocity multiplication in colliding balls Read More
• #### C7-19: GAUSSIAN GUN

Demonstrate transfer of energy in an elastic collision Read More
• #### C7-21: ENERGY AND MOMENTUM - COLLISION AND PROJECTILE

Illustrate conservation of momentum and conservation of energy Read More

• #### C7-24: SILLY PUTTY

Show collisions with an unusual material Read More
• #### C7-25: SUPERBALL, VACUUM MUD AND WOOD BLOCK COLLISIONS

Show that a larger impulse is imparted by an elastic collision Read More

• #### C7-42: AIR TABLE - COLLISIONS OF PUCKS

Qualitatively demonstrate elastic and inelastic two-dimensional collisions Read More
• #### C7-43: AIR TABLE - SMALL - COLLISIONS OF PUCKS

Demonstrate collisions of pucks on an air table in rooms not accessible by the large air table Read More

• #### C7-51: BALLISTIC PENDULUM - PELLET GUN

Determine the speed of an air gun pellet using a ballistic pendulum Read More
• #### C7-52: BALLISTIC PENDULUM - LABORATORY MODEL

Demonstrate operation of the standard laboratory type ballistic pendulum Read More
• #### C7-53: AIR TRACK - SPEED OF AIR GUN PELLET

Determine the speed of an air gun pellet using conservation of momentum in an inelastic collision Read More
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