Answer:mechanical waves.
Explanation:
Mechanical waves require the particles of the medium to vibrate in order for energy to be transferred. For example, water waves, earthquake/seismic waves, sound waves, and the waves that travel down a rope or spring are also mechanical waves.
Benthos
Option b is the answer
Less because now there is less force on the scale and you are unbalanced. Therefore the scale will have a lower number then before.
Friction as it will move charge (electrons) from one object to another
