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    1. A box is touching the floor. The normal force of the floor on the box depends on... (see attachment for rest)

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    1.) Answer: C
    To find the normal reaction of the ground, we take into consideration the vertical components of all the forces and equate to the mass*acceleration.

    2.) Answer:C
    The component of weight of the car along the hill = m*g*sin(18)
    = 800*9.8*sin(18) = 2422.69 N downward
    THerefore the friction force will be uphill and equal to this component.

    3.) Answer : B
    Because car ...

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