Which one of the following is a non-conservative force?
Correct answer: D. Frictional force
- A. Electric force
- B. Elastic spring force
- C. Gravitational force
- D. Frictional force
Explanation
Conservative forces, such as gravitational, electric, and elastic spring forces, depend only on the initial and final positions of an object, meaning the work done is independent of the path taken. On the other hand, frictional force is a non-conservative force because the work done by friction depends on the path taken. This is because frictional forces convert kinetic energy into thermal energy, which is dissipated and cannot be recovered, making the process path-dependent.
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Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
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