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Forces, free body diagrams, and work

Please give complete solutions step by step. Thanks again for helping me!

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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