a bat hitting a baseball a paper clip attracted to a magnet a refrigerator pushed across the floor a bicycle tire rubbing against the road
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of these is an example of a non-contact force acting on an object?
Possibilities:
- a bat hitting a baseball
- a paper clip attracted to a magnet
- a refrigerator pushed across the floor
- a bicycle tire rubbing against the road

a paper clip attracted to a magnet