Consider forces, work, and potential energy Which of the following forces are conservative forces? Group of answer choicesFrictionGravityIdeal springRocket thrustTensionNormalDrag
Question
Consider forces, work, and potential energy Which of the following forces are conservative forces? Group of answer choicesFrictionGravityIdeal springRocket thrustTensionNormalDrag
Solution
The conservative forces from the list you provided are Gravity and the force from an Ideal spring.
Conservative forces are those forces for which the work done in moving a particle between two points is independent of the path taken. In other words, the work done by conservative forces can be recovered.
Gravity is a conservative force because the work done against gravity in lifting an object can be recovered when the object falls back down.
The force from an ideal spring is also conservative because the work done in compressing or extending a spring can be recovered when the spring returns to its original position.
Friction, Rocket thrust, Tension, Normal, and Drag are non-conservative forces. The work done against these forces is lost and cannot be recovered. For example, the work done against friction is dissipated as heat and cannot be recovered.
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