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Newtons Laws newton :, examples of contact forces:, image, image - Coggle…

- - - - a=0m/s/s
        
        stay at rest
    - - a=0m/s/s
        
        stay in motion
  - - - Free body diagrams are used to show the relative magnitude and direction of all forces acting upon an object at that given time
      - Strategy for FBD:
        
        Read the problem
        
        Determine ALL forces
        
        Determine direction
  - - - Contact Forces: "forces that result when the two interacting objects are perceived to be physically contacting each other"
        
        Action-At-A-Distance Forces: Types of forces that result even when the two interacting objects are not in physical contact with each other, yet are still able to exert a push/pull
        
        Static Friction:: when the surface of two objects are at rest relative to one another and a force exists on one of the other objects to set it into motion relative to the other object
        
        Ffrict - static = (mu) frict - static x Fnorm
        
        Examples of action at a distance forces:
        
        Gravitational Force: (Fgrav) the force with which the Earth, Moon and other massively large object attracts another object towards itself (the weight of an object)
        
        Mass: the amount of matter an object possess (kg)
        
        Weight: the force of gravity acting upon an object (N)
        
        Electrical Force
        
        Magnetic Force
- - - - Net force: the vector sum of all forces
      - Force is not required to keep an object moving, its only required when an object is accelerating
    - - there is an acceleration
      - The acceleration depends directly on the "net force"
      - The acceleration directly depends inversely upon the objects mass
    - - acceleration (x2) = inverse mass (/2)
      - EQUATIONS:
        
        Fnet = ma
        
        Fgrav = mg
        
        Ffrict = μ (Fnorm)
        
        a = Fnet/m
        
        Fapp - Ffrict = ma
        
        Fnorm = mg
- - - - "action reaction force pairs"
      - Friction:
        
        smoother surface = less friction
        
        The force of friction is always opposite the direction of motion of a force attempting to put an object in motion"
        
        Static friction: resists initiation of motion
        
        Fmax = µ N
        
        µ = unique and unitless; can look up coefficents on internet
        
        Fapp > Fmax
        
        (object will accelerate) Fapp > 0
        
        use static friction to see if initial force can exceed it, then kinetic friction takes over
        
        Kinetic Friction: resists motion of moving object
        
        coefficients are diff from static coefficients
        
        Fk < Fs
        
        Viscosity: a fluids resistance to flow
- - - - cross section area: area looking directly at you