AP PHYSICS 1 UNIT 4 PROGRESS CHECK A, AP PHYSICS 1 UNIT 4 PROGRESS CHECK B QUESTIONS AND FULL SOLUTIONS

A block of mass M on an inclined surface is attached to a spring of negligible mass, as shown. The other end of the spring is attached to a wall, and there is negligible friction between the block and the incline. The block is pulled to a position such that the spring is stretched from its equilibrium position. The block is then released from rest. Which of the following systems can be classified as a closed system? A system consisting of the block, spring, and Earth The total mechanical energy of a system as a function of time is shown in the graph. Which of the following statements is true regarding the system? The system should be classified as an open system because mechanical energy can be added and removed from the system.