frictional forces slowing down a rolling soccer ball the magnetic force pulling paper clips to a powerful electromagnet the magnetic force pushing two magnets apart the force of gravity acting on raindrops that fall to Earth
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which type of force requires contact between two objects for one to push or pull the other?
Possibilities:
- frictional forces slowing down a rolling soccer ball
- the magnetic force pulling paper clips to a powerful electromagnet
- the magnetic force pushing two magnets apart
- the force of gravity acting on raindrops that fall to Earth

frictional forces slowing down a rolling soccer ball