Coffee can rubber band-Comeback Can - Museum of Science and Industry

Physics projects are fun , wait, what? Yes, I really did just say that. As someone who struggled with physics in college when reading about it in a book, I am a true believer that hands-on physics projects are the best way to grasp scientific concepts like energy, motion, inertia, gravity etc. If your kids like to trick their friends, they must do this project! Go test it!

Coffee can rubber band

Coffee can rubber band

Coffee can rubber band

Coffee can rubber band

Coffee can rubber band

Choose an Account to Log In Google accounts. The secret is in the weight and rubber band inside the can. Bookmark this to easily find it later. The center of mass 3. Tell us about yourself I am a:.

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I guess it's not worth it to create gears for Chasey pantyhose project, I'll save that Coffee can rubber band the rat-trap powered cars later this year in transportation technology. Nothing is incorrect yet. Basically Abercrombie model porn requirements are that it has to be powered with a rubber band and be a standard sized coffee can. When the student first uses the can, roll the can in one direction such as clockwise for a few turns. Roll it out and allow it to roll back to you. Sign In or Register to comment. Two holes about one inch apart are punched into the top and bottom of the can using the nail. The can is brought to rest when the Coffee can rubber band energy is spent in friction and in the act of twisting the rubber band. What is friction? Objectives The student knows that energy cannot be created or destroyed, but only changed from one form to another. Reply 5 of 6. Will a perfectly elastic body keep Coffee can rubber band shape and when will it lose its shape? Construct a can as an example. How far did your can roll?

Description Amaze students with a can that rolls away a few feet, mysteriously stops, hesitates, and then rolls back to where it started.

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  • Description Amaze students with a can that rolls away a few feet, mysteriously stops, hesitates, and then rolls back to where it started.

If you time it just right, you can figure out when the can will start to roll back to you. Then you can "tell" the can to come back, so that it looks like the can is doing what you tell it to do! To understand how the comeback can works, you have to understand energy.

Energy comes in many forms. One form of energy is motion, called kinetic energy. The comeback can uses both forms.

When you push the can, you give it kinetic energy and it moves away from you. The hex nut holds one length of rubber band still while the rolling can causes the other rubber band to twist around it. The can rolls until the rubber band is completely twisted.

This is when kinetic energy becomes potential energy - the can is not moving, but it has the ability to do so. As the rubber band unwinds, the potential energy again becomes kinetic energy and the can rolls back to you. Hands-On Science. Surprise your friends by making a can that rolls back to you when you tell it to!

Materials Empty can with a lid like a coffee, oatmeal or paint can Twist tie or short pipe cleaner Hex nut Large rubber band Scissors Directions Punch two holes in the lid and the bottom of the can. Cut the rubber band once so it is one long strip. Thread the rubber band through the holes in the bottom of the can so that both ends are inside the can.

Wrap the pipe cleaner or twist tie around the hex nut. You should have two "bunny ears" of equal length sticking up when you're done. The hex nut should hang from the middle of the rubber bands. Place the can on the floor and gently roll it away from you. Watch what happens!

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The students will answer the following questions to indicate understanding. Can you make a bigger toy and what will it do? The teacher should act surprised when the can returns on its own power. Where is the center of mass? The answers will be much different from the beginning.

Coffee can rubber band

Coffee can rubber band

Coffee can rubber band

Coffee can rubber band

Coffee can rubber band

Coffee can rubber band. A Mysterious Roll-Back Can

I'd go for just enough weight to ensure a low-slip transfer of energy through the wheels. I'd also make a racer with an aerodynamic shape, because you have nothing to gain from air resistance. You might want to consider some sort of simple gearing to release your rubber band's energy slowly. Since you want to maximize distance, not speed, I believe you should research this to be sure I'm not full of it! This is all about an energy budget: Your rubber band gives you only so much energy.

Your racer stops moving as soon as friction from various sources has turned all of your rubber band's energy into heat. Reply 2 of 6. August 31, PM. I guess it's not worth it to create gears for this project, I'll save that for the rat-trap powered cars later this year in transportation technology.

Reply 3 of 6. The "I fell lucky" hit on Google with rubber band car. Guess not. Reply 4 of 6. Reply 5 of 6. Make the can instructions are below and show it working to the students. Roll it out and allow it to roll back to you. Do not tell the students why or what is happening. Ask then to spectulate what is happening and why. Let the students guess at every thing. Nothing is incorrect yet. The secret is in the weight and rubber band inside the can.

As you roll the can away from you, the rubber band winds up against the weight. The weight because it is heavy will remain suspended vertically as the can rolls and the rubber band twists up. This twisting stores the potential energy that is then released as kinetic energy as the can rolls back. This storing of energy can also be considered conservation of energy. Building the Come Back Can 1. Take a coffee can, Cheeto can or any tin can four or five inches in diameter with a replaceable plastic top.

It works better if both ends of the can have been cut out and two replaceable plastic tops have been substituted, one on each end. The fact that there are two equal tops makes the can roll evenly in a straight line.

If only one plastic end is used, the diameter of one end is larger than the other end and the path of the can becomes curved. The can will not move well on carpets or rough, bumpy surfaces. Two holes about one inch apart are punched into the top and bottom of the can using the nail.

Cut a rubber band apart or cut some sewing elastic and tie it in place as shown in the drawing in the Associated Files with the weight suspended as shown. Do not use a really fat rubber band as it will not store up much energy and will not work properly.

When the student first uses the can, roll the can in one direction such as clockwise for a few turns. This will allow the can to store energy in the beginning. Roll the can on the floor. The can will pause and then return to its original position. Students may decorate the can with construction paper and crayons. After students have completed making their cans allow them to play with them and ask the students to describe what is happening.

The answers will be much different from the beginning. The rubber band passes through the weight and the weight hangs below the axis, so that the center of mass is below the axis. The figure is therefore always erect because of the turning moment of its center of mass.

The rubber bands winds up as the can is rolled. This twist stores elastic energy in the rubber band. The can is brought to rest when the original energy is spent in friction and in the act of twisting the rubber band. The elastically stored energy in the rubber band provides a torque, which causes the can to roll back. Please understand that the rubber band along the axle of the pair wheels makes a connection at the hubs in such a manner as to permit a torque to arise from the twist.

Torque is a force that produces rotation. The rate of change of momentum with respect to the table will be proportional to the impressed force. Diagram is located in Associated files. Assessments The teacher will make the initial can and cover it so the students can not see what the mysterious can is made of. Then the teacher will gently roll out the can on a flat surface slowly. The can will roll along, come to a stop, and then roll back to the teacher.

The teacher should act surprised when the can returns on its own power. Look up at the students and ask with BIG eyes, "What happened? Have the students take notes while the teacher is explaining the toy to the students. The students will answer the following questions to indicate understanding.

The questions can be answered individually or in a whole group setting. Students who do not grasp the concept about energy changing and storing will need further instruction.

Physics projects are fun , wait, what? Yes, I really did just say that. As someone who struggled with physics in college when reading about it in a book, I am a true believer that hands-on physics projects are the best way to grasp scientific concepts like energy, motion, inertia, gravity etc.

If your kids like to trick their friends, they must do this project! Go test it! On a flat surface gently roll your can away from you. It should roll away, stop, and then roll back! The Rollback Can physics project displays the concept of transfer of energy. One type of energy is called kinetic energy — that is energy in motion. Another type of energy is called potential energy , that is energy that is stored up and ready to be released.

When you roll the can, the kinetic energy of the rolling is transferred to the rubber band, which twists tightly and is prevented from turning along with the can by the offset weight. As the rubber band twists, the energy becomes potential stored energy. Now that your kids see how much fun that physics is, you should take them to the Kidpsace Physics Forest.

Kidspace has also been kind enough to sponsor two giveaways to all of you, one prize is for local LA residents and the other is for those of you who live around the world. A resounding yes! The rollback can is a simple physics project that will amaze kids and a great demonstration of potential and kinetic energy.

And psst…it also doubles as a great party trick! We did this today and it was awesome. He played with it for hours perfecting the timing of performing the magic of calling the can back.

Thank you for the easy to follow instructions and simple science concepts.

Coffee can rubber band