- A cloth is a kind of object
- A plastic strip is a kind of object
- So, a cloth and a plastic strip are kinds of object

- A cloth and a plastic strip are kinds of object
- There is a negatively-charged piece of cloth
- There is a negatively-charged plastic strip
- Charge is a property of an object and includes ordered values of negatively-charged / neutral / positively-charged
- Therefore, the piece of cloth and plastic strip have the same charge of negative charge

- A cloth is a kind of object
- A plastic strip is a kind of object
- Therefore, a cloth and a plastic strip are kinds of object

- The piece of cloth and plastic strip have the same charge of negative charge
- A cloth and a plastic strip are kinds of object
- If two objects have the same electrical charge then those two objects will repel each other when they are close to each other
- Therefore, the negatively-charged plastic strip and negatively-charged piece of cloth will repel each other

Therefore, the negatively-charged plastic strip and negatively-charged piece of cloth will repel each other
Which pair of items will repel each other?
- There is a negatively-charged piece of cloth 
- A cloth is a kind of object 
- There is a negatively-charged plastic strip 
- A plastic strip is a kind of object 
- If two objects have the same electrical charge then those two objects will repel each other when they are close to each other 
- Charge is a property of an object and includes ordered values of negatively-charged / neutral / positively-charged