A crate is placed on flatbed truck but is not tied down. The truck accelerates in the positive x-direction (to the right, as shown) too fast and the crate falls off the back of the truck. There is friction between the truck bed and the crate. When the crate falls off, in what direction is it moving relative to the ground?  It is not moving with respect to the ground. To the left (negative x-direction). To the right (positive x-direction). A friction force acts on the crate while it is in the truck bed. Which of the following statements is true?  The friction force is perpendicular to the motion of the crate. The friction force is in the opposite direction of the motion of the crate relative to the ground. (Friction always opposes motion). The friction force is in the same direction as the motion of the crate relative to the ground.

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