Question

The normal force acting upon the car is best represented by arrow
.

The force of gravity acting upon the washers is best represented by arrow
.

The applied force on the car is best represented by arrow
.

Answer 1

I don't have the diagram or the arrow labels, so I can't pick the letters/labels for you. Please either upload the image or describe the arrows (their labels and directions).

Meanwhile, how to identify each in the picture:
- Normal force on the car: the arrow perpendicular to the contact surface pointing away from the surface (usually upward from the road).
- Gravity on the washers: the arrow pointing straight downward (toward Earth) through the washers' centers.
- Applied force on the car: the arrow showing the push or pull that makes the car move (the arrow in the direction of the applied push/pull, e.g., horizontally forward if the car is being pushed forward).

If you tell me which labeled arrow points up/down/left/right or upload the diagram, I’ll label them for you.