1. The problem statement, all variables and given/known data A large box containing your new computer sits on the bed of your pickup truck. You are stopped at a red light. The light turns green and you stomp on the gas and the truck accelerates. To your horror, the box starts to slide toward the back of the truck. (Assume that the truck is accelerating to the right.) Draw clearly labeled free-body diagram for the truck. (The bed of the truck is not frictionless.) Draw the force vectors with their tails at the dot. The orientation of your vectors will be graded. The exact length of your vectors will not be graded but the relative length of one to the other will be graded. 2. Relevant equations Nground: normal force Nb: reaction to the normal force on the box from the truck Froad: Reaction force to tires' backward push Fk: box friction force on the truck bed Wt: weight of truck 3. The attempt at a solution 1st attempt: Nground and Nb pointing upwards, length of Nground longer than Nb. Fk pointing right. Froad pointing left. Wt pointing down. *length of my Nground and Wt arrows are equal 2nd attempt: Nground and Nb pointing upwards, length of Nground longer than Nb. Fk and Froad pointing right, length of Froad longer than Fk. Wt pointing down. *length of my Nground and Wt arrows are equal However i can't seem to get the correct free body diagram for this. Can anyone help? Should i change the Nb of my 2nd attempt to acting downwards instead of acting upwards?