State and brave law of conservation
angular momentum ,
examples
of angular
Give some
Answers
Answer:
The law of conservation of angular momentum states that when no external torque acts on an object, no change of angular momentum will occur.
Answer:
Conservation of Angular Momentum
Explanation:
The law of conservation of angular momentum states that when no external torque acts on an object, no change of angular momentum will occur.
LEARNING OBJECTIVES
Evaluate the implications of net torque on conservation of energy
KEY TAKEAWAYS
Key Points
When an object is spinning in a closed system and no external torques are applied to it, it will have no change in angular momentum.
The conservation of angular momentum explains the angular acceleration of an ice skater as she brings her arms and legs close to the vertical axis of rotation.
If the net torque is zero, then angular momentum is constant or conserved.
Key Terms
quantum mechanics: The branch of physics that studies matter and energy at the level of atoms and other elementary particles; it substitutes probabilistic mechanisms for classical Newtonian ones.
torque: A rotational or twisting effect of a force; (SI unit newton-meter or Nm; imperial unit foot-pound or ft-lb)
angular momentum: A vector quantity describing an object in circular motion; its magnitude is equal to the momentum of the particle, and the direction is perpendicular to the plane of its circular motion.
Let us consider some examples of momentum: the Earth continues to spin at the same rate it has for billions of years; a high-diver who is “rotating” when jumping off the board does not need to make any physical effort to continue rotating, and indeed would be unable to stop rotating before hitting the water. These examples have the hallmarks of a conservation law. Following are further observations to consider:
1. A closed system is involved. Nothing is making an effort to twist the Earth or the high-diver. They are isolated from rotation changing influences (hence the term “closed system”).
2. Something remains unchanged. There appears to be a numerical quantity for measuring rotational motion such that the total amount of that quantity remains constant in a closed system.
3. Something can be transferred back and forth without changing the total amount. A diver rotates faster with arms and legs pulled toward the chest from a fully stretched posture.