What is the principle of rubber band elastic car?

In the school handicraft class, many people have made elastic rubber band trolleys, made of rubber bands, cardboard and other materials. To make it run, just pull the rubber band open and the car will run forward after letting go. The principle is mainly to use the elastic potential energy generated by the deformation of the rubber band to convert it into kinetic energy, thus driving the car forward. The method of making a power car with rubber bands is not complicated. There are two ways to make it. Let's have a look. 1. What is the principle of rubber band elastic car?

Rubber bands are generally used to bind things, but elastic rubber bands can also be used to do some scientific experiments, such as the common rubber band power car, which is driven by the power of rubber bands. What is the principle of rubber band power car?

The working principle of rubber band elastic car is mainly to convert elastic potential energy into kinetic energy. Rubber bands are very elastic. Using the elasticity of the rubber band, the rubber band is wound around the axle. Because the rubber band is deformed, the elastic potential energy is converted into kinetic energy when it is released, and the car will get a forward thrust, thus moving forward. So how to make a rubber-band power car?

Second, the rubber band power car manufacturing process

The production of rubber band power car is not complicated, and the manual production method is relatively simple. Here are two ways to make it:

Method one

1. Preparation materials: cardboard, ballpoint pen core, toothpick, rubber band, ruler, scissors and hot melt glue gun.

2. Cut off the tip of the toothpick and make two shafts; Cut the ballpoint pen core into four short strips with the length of 1cm; Cut a rectangle out of cardboard smaller than a toothpick.

3. Cut a notch on the left side of the cardboard and two small notches on the right side to cover the rubber band. Then cut four disks of the same size from the cardboard and poke holes in the middle to make wheels.

4. Put the rubber band on the toothpick, fix it with hot melt adhesive, then put ballpoint pen cores on both ends, and stick the two pen cores on the cardboard to ensure that the toothpick can rotate; The other toothpick is also treated in the same way and stuck to both ends of the cardboard respectively.

5. Install four wheels, put hot melt adhesive on the top and fix the wheels.

6. Stretch the other end of the rubber band and put it on the gap of the cardboard, then turn the rear wheel, roll the rubber band onto the toothpick, put it on the table, release your hand, and the rubber band power car will run away.

Method 2

1. Preparation materials: plastic wrap tubes, CDs, wooden buttons, disposable chopsticks, rubber bands, buttons, straws and paper clips.

2. Glue the wooden button and CD together, and glue the button on the other side to make the wheel.

3. Punch four symmetrical holes in the front and back of the plastic wrap tube, insert disposable chopsticks, then put the cut straw on the chopsticks, install a wheel made of CD, and add some glue to the wooden buckle to fix the wheel.

4. Prepare a rubber band with a suitable length, put it on chopsticks from the plastic wrap tube, tie it tightly, put a paper clip on the other end of the rubber band, let the paper clip pass through the plastic wrap tube with the rubber band, come out from the other end of the plastic wrap tube, and clamp the paper clip on the tube wall of the plastic wrap tube to complete a rubber band power cart.

5. Turn the tire, wrap the rubber band around the chopsticks, and then loosen it. The rubber band power car runs under the action of converting elastic potential energy into kinetic energy.