"Using Rubber Bands as Power" Motion and Force PPT

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"Using Rubber Bands as Power" Motion and Force PPT

Part One: Installing the Rubber Band Driven Car

Connect the rubber band loops and secure one end to the frame. Turn the wheel and wrap the other end of the rubber band around the axle.

Release your hand from turning the wheel and the wheel will turn.

Where does the force that makes the wheel come from?

To make the car move forward, in what direction should the rubber band wrap around the axle?

The direction of the rubber band winding is opposite to the direction of movement of the car.

Using rubber bands as power PPT, part 2: the number of turns of the rubber band and the distance traveled by the car

How can we design experiments to test our conjectures?

hint:

1. Only change the number of turns of the rubber band and keep other conditions unchanged.

2. The number of winding turns will be decided through group discussion (for example, 2, 4, 8 turns).

3. Conduct experiments on the runway.

4. Count based on the number on the grid pressed by the previous wheel.

5. Teams work together to complete the experiment.

Pay attention to the following observations when experimenting:

1. Is the force generated by the rubber band the same when it is wound once and when it is wound multiple times?

2. When the rubber band is wound once and multiple times, does the force of the rubber band act on the car for the same time?

What is the relationship between the number of turns of a rubber band wrapped around the axle and the distance the car travels?

If the number of laps is doubled, will the distance traveled by the car also be doubled?

Why is there such a relationship?

The number of rubber band turns is not proportional to the distance traveled by the car.

Within a certain range,

The more turns the rubber band has, the more elastic it will be and the car will travel farther;

The number of turns of the rubber band is small, and its elasticity is small, so the car can travel closer.

Using rubber bands as power PPT, part 3: How the force of rubber bands is generated

Why can we use rubber bands as power to drive a car?

How does the elasticity of a rubber band come about?

Objects such as rubber bands and springs can easily change their shape when acted upon by external forces. When their shape changes, they will generate a force to restore their original shape. This force is called elastic force. When they return to their original shape, the elasticity is gone.

People can do a lot of things with elasticity. Elastic bands, money clips, bows and arrows, tensioners and various springs all utilize the elasticity of objects.

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Update Time: 2024-09-28

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