Question

Please do all define in very shortly and simple language it's my humble request to u please help me ​

Answer 1

1. Contact forces are forces that act between two objects that are physically touching each other.
2. the force of attraction between all masses in the universe; especially the attraction of the earth's mass for bodies near its surface.
3. magnetic force, attraction or repulsion that arises between electrically charged particles because of their motion. ... The magnetic force between two moving charges may be described as the effect exerted upon either charge by a magnetic field created by the other