the truck are both accelerating along the x direction and at the same rate, so Learning Goal: To practice Problem-Solving Strategy 7.1 for interacting-objects problems. aç = aT = az. A 1200 -kg car is pushing an out-of-gear 2160 -kg truck that has a dead battery. When the driver steps on the accelerator, the drive wheels of the car push horizontally against the ground with a force of 4580 N. The rolling friction of the car can be neglected, Solve but the heavier truck has a rolling friction of 765 N including the "friction" of turning the truck's drivetrain. What is the magnitude of the force the car applies to Part C the truck? What is the magnitude FconT of the force that the car exerts on the truck? Use the coordinate system shown in Part B, where upward is the positive y direction and to the right, the direction FConT points, is the positive x direction. Express your answer in newtons to three significant figures. • View Available Hint(s) ΑΣφ ? FConT = Submit

We often think of friction and air resistance as forces that we want to minimize because they can hinder the motion of an object.  But they are not always undesirable, and in fact, can be an essential element in a machine or process. Identify one or two applications that depend on friction and air resistance.  Explain how friction or air resistance works in those situations and what would happen if there were no friction or air resistance.  Your initial post should be 75-150 words in length and is due on Sunday.

2. A 3.00 kg block is placed at the top of a 21.0° rough inclined plane with us = 0.325 and Hk =0 .215 %3D and a length of 1.78 m. a) Draw a free-body diagram of the block. b) Prove that, if released from rest, the block will immediately start sliding. c) Find the magnitude of the block's acceleration. d) Calculate the time the block takes to reach the end of the incline.

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