4.3.2 Conservative and Nonconservative Forces Flashcards
Conservative and Nonconservative Forces
- A conservative force does no net work on an object moving through any closed path.
- With conservative forces, energy can be converted between potential and kinetic energies.
- Examples of conservative forces are gravity, the force of an ideal spring, and the force of static electricity. Examples of nonconservative forces are friction and air drag.
How is energy stored in a block that has been lifted?
As potential energy
Which of the following formulas can be used to calculate the work done by a nonconservative force?
W = delta K
The work done on a system by nonconservative forces _______________.
becomes thermal energy
How much work must be done to drag a block along a circular path on a frictionless surface?
No work is done.
Which of the following is a nonconservative force?
Viscosity
Consider a ball dropped into a vat of fluid. Which of the following best determines the amount of work done by the fluid’s drag force?
W = delta U between two points in the vat
Which of the following is true about the work done by a nonconservative force?
It is always negative.
How is energy stored in a block being pushed along a rough surface?
It is not stored.
______________ is the same in both conservative and nonconservative forces.
The relationship between work and total energy.
