Your dynamic sculpture combines magnets, springs, and elastic bands with a variety of moving parts, including levers, pulleys, and pendulums. When someone jostles those parts, a complicated series of motions occurs and predicting how things will proceed seems nearly impossible. You point out, however, that there is a simple rule governing the motion of each part at any moment in time. That rule is that each part1 pointcontinues in motion at constant velocity.moves when it experiences a net force and stops when the net force on it is zero.has constant energy, momentum, and angular momentum.accelerates in the direction that reduces its total potential energy as quickly as possible.
Question
Your dynamic sculpture combines magnets, springs, and elastic bands with a variety of moving parts, including levers, pulleys, and pendulums. When someone jostles those parts, a complicated series of motions occurs and predicting how things will proceed seems nearly impossible. You point out, however, that there is a simple rule governing the motion of each part at any moment in time. That rule is that each part1 pointcontinues in motion at constant velocity.moves when it experiences a net force and stops when the net force on it is zero.has constant energy, momentum, and angular momentum.accelerates in the direction that reduces its total potential energy as quickly as possible.
Solution
The rule that governs the motion of each part at any moment in time is Newton's second law of motion. This law states that an object will accelerate if there is a net force acting upon it. The direction of the acceleration will be the same as the direction of the net force. So, the correct answer is: each part moves when it experiences a net force and stops when the net force on it is zero.
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