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Chapter 7 (Types of interaction (electrostatic (e.g. pushing hands…

- - - - the contact force you feel is due to the electrostatic repulsive forces between electron clouds around the atomic nuclei in your hands
- - - - therefore if velocity changes there must be a resultant force acting on the object
      - velocity is a vector so changes if speed and/or direction changes
  - - - F ∝ Δp/Δt == F = kΔp/Δt
        
        therefore F = Δp/Δt
        
        net force = change in momentum / change in time
        
        force, F (N)
        
        momentum, p (kg^-1)
        
        time, t (s)
  - - - the forces acting on the interacting objects are of the same type
        
        examples:
        
        Electrons have a negative charge and exert an electrostatic repulsive force on each other
        
        Unlike poles of two magnets exert a pair of equal and opposite magnetic forces.
        
        each interaction involves a pair of forces
        
        in newton's third law, your never see both forces acting on the same object
        
        Jumping off a wall and falling towards the earth: you and earth are interacting. gravitational force exerted by earth (your weight) is equal and opposite to the gravitational force that you exert on the earth
- - - - when object collide, the total momentum before and the collision is the same as after the collision.
        
        this fact can be used to determine the motion of interacting objects