Action force and reaction force ———— Brush car

Principles and Inquiry:

1. Elasticity: OccursElastic deformationThe object, due to its desire to return to its original state, exerts force on the object with which it comes into contact. This force is known as elastic force. The change in shape or volume of an object caused by the application of force is called "elastic deformation."Deformation在外力停止作用后，能够恢复原状的形变叫做弹性形变。发生弹性形变的物体，会对跟它接触且阻碍它恢复形变的物体产生力的作用。这种力叫弹力。即，在Elastic LimitWithin the scope, the force generated by an object on the force applied to deform the object is called elastic force.

2. The car scrubber is composed of the body brush, a motor, and batteries, with a long cotton swab and elastic band at the other end of the swab.

Working Principle: The motor provides power, the bristles deform, making the brush move forward to clean the car.

car washing

 Don't underestimate this set of materials! A simple little brush can become quite magical in the hands of children. It not only vibrates but can also trace different paths according to the children's designs. Ha ha, isn't it fun?

Experimental focus: Understanding the simple configuration principles of the brush car.

Experimental Objectives: 1. To understand the main components of the car washing machine. 2. To know the role of each component in the car washing process.

Experimental Cognition

 Brush: A platform for installing motors and switch battery boxes.

 Motor: Brush Car Power

 Battery Box: Power Supply Device

Knowledge Expansion:
 The motion effect of the rotating brush car is closely related to its manufacturing process. Different assembly methods, such as the position of the motor installation, the balance, and the bending angle of the swabs, will all affect the motion effect of the brush car. The diagram shows only one type of assembly method. In actual operation, the motor can be placed in the middle or one side of the brush car, and thick foam adhesive can be used to adjust the balance of the car.
 During the activity, children can first complete the basic assembly to make the car rotate. Then, various inquiry tasks can be proposed, such as "find a way to make the car move along a straight line." By encouraging children to explore and practice through interesting inquiry questions, they can not only understand the characteristics of object motion and stimulate their thinking, but also experience the process of failure - thinking - practice - again failure - again practice. This is also beneficial to the cultivation of their will quality.

Experiment Report: