Net force and Acceleration

Cause and effect concept    

Galileo Galilei        Invisible forces          

Net force and acceleration

Free body diagram 

Zero net force 

Terminal velocity 

Inclined plane

 Many bodies dynamics

Newton realization for action / reaction         on/by convention     

Driving force and Friction 

Why friction might be tricky 

Drag force vs Friction 

Friction and pulling a car 

More about static friction 

Dynamic friction 

Sliding vs Skidding 

Galileo and friction 

Resistive force vs friction  

Contact push       

Tension is pull force          

Spring force          

Weight            

Normal / Reaction force            

 Friction          

Viscous drag          

Upthrust/Buoyancy        

Lift force