This physics video tutorial answers the question on what is a force. It also explains the difference between contact forces, short range forces, and long range forces.
Types of Forces: https://www.youtube.com/watch?v=E626-DiQgRs&t=2s
Net Force: https://www.youtube.com/watch?v=tfAJDST3cjo&t=2s
Tension Force: https://www.youtube.com/watch?v=F5oqJ5t-pa4&t=2s
Free Body Diagrams: https://www.youtube.com/watch?v=52R61aSWHg0
