What scientific principle(s) does the toy yo-yo use? Explain in simple words if you can.

Explanation

In my honest opinion I believe that the yo yo toy uses the principle of simple harmonic motion coupled with the principle of conservation of energy

1. The principle of simple harmonic

Explains/describes it to and fro movement up and down and sides ways

2. The principle of conservation of energy explains how it stores energy in potential form(bounces to the hand ) and converts it to kinetic energy (bounces away from the hand).

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia