Chose the correct option for a light and heavy body falling under gravity through vacuum.
Correct answer: D. Both will reach the ground at the same time
- A. Heavy object will reach the ground first
- B. Light object will reach the ground first
- C. Heavy object will fall faster
- D. Both will reach the ground at the same time
Explanation
In a vacuum, there is no air resistance to affect the rate at which objects fall. According to the principle of equivalence, in a gravitational field, all objects accelerate at the same rate regardless of their mass. Thus, both the light and heavy objects will reach the ground at the same time if released simultaneously in a vacuum. The incorrect options assume that mass affects the fall rate when, in fact, it does not in a vacuum.
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Fluid flow is described through speed, pressure and density, including steady flow and the equation of continuity for conserving mass. Bernoulli's equation relates pressure, speed and height, while fluid drag and terminal velocity explain why a falling object eventually moves at constant speed when drag balances its weight.
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