Which of the following is a conservative force?
Correct answer: C. Gravity
- A. Air resistance
- B. Friction
- C. Gravity
- D. Convection
Explanation
Gravity is the correct answer as it is a conservative force; the work done only depends on the initial and final positions, not the path. Air resistance and friction are non-conservative forces because they convert mechanical energy into other forms like heat, and the work done depends on the path taken. Convection is unrelated to the concept of conservative forces, as it refers to the movement of heat through fluids.
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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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