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FORCES - Coggle Diagram

- - - - Useful
        
        walk without falling
        vehicles to stop when brakes are applied
        slow down the fall of parachutist to ensure safe landing
      - Harmful
        
        increases effort to operate machines
        causes wear and tear
        produces heat which may cause damages
        
        apply lubricants like oil on moving parts
        fix ball bearings / wheels / rollers
        use magnetic repulsion like bullet trains
  - - - magnetic substances and magnets
        unlike poles
    - - like poles