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LAB SESSION STATIC FRICTION (EXPERIMENT (MEASUREMENT (determine of µ s…

- - - - static coefficient of friction
        
        a small horizontal force => NOT MOVING
        
        Newton's law: by a 2nd force = STATIC FRICTION FORCE
        
        Max. static friction force = Min. acting force (need to start the motion) :red_flag:
        
        NOT a property of an object
        
        a property of a pair of contact surfaces
        
        1 more item...
        
        Dry, non-lubricated surfaces:
        
        independent of the contact area
        
        proportional to normal force on the surface. :question:
        
        opposite direction
        = magnitude
        
        a prismatic object (at rest) on horizontal surface
      - At the equilibrium state
        
        theta: angle b/w inclined plane and horizontal surface :question:
        theta s: critical angle = theta at the instant the block starts sliding down :red_flag:
        
        the block
        
        plastic
        
        9
        10
        14
        11
        12
        
        bright metal
        
        Angle (°)
        9
        9.5
        8
        
        dark metal
        
        7
        6
        6
        
        rubber
        
        32
        30
        30
        
        small wooden block
        
        24
        22
        27
        23
        
        with 100 g
        
        23
        26
        26
        26
        
        200 g
        
        23
        22
        22
        
        big wooden block
        
        22
        24
        25
        27
        
        with 100 g
        
        20
        25
        25
        26
        
        with 200 g
        
        23
        24
        25
        
        white (plastic?) block
        
        10
        11
        11
    - - Newton's second law: F R = 0
        
        OR
        
        T: tension force in the string acting on the vehicle (read from dynamometer
        N: normal force from plane on the vehicle
        m.g: vehicle's weight
        
        Resolving the vectors in x and y components
        
        verification of Newton's law of equilibrium
        
        read dynamometer
        
        θ= 15°
        
        0.29
        0.27
        0.29
        
        θ= 25°
        
        determine adjustment error on T
        
        up
        
        1 more item...
        
        down
        
        1 more item...
        
        θ= 10°
        
        0.19
        0.2
    - - position of the end of the spring
        
        directions of both forces (indicate the axis of both springs)
        
        magnitude of both forces
      - magnitude and direction of the force