Question

Two expressions were used for the drag force experienced by a moving object in a liquid. One depended upon the speed, while the other was proportional to the square of the speed. In which types of motion would each of these expressions be more applicable than the other one?

a) Low-speed motion; high-speed motion
b) High-speed motion; low-speed motion
c) Constant speed motion; variable speed motion
d) Vertical motion; horizontal motion

Answer 1

The expression for the drag force experienced by a moving object in a liquid depends on the speed of the object. For low-speed motion, the drag force is more accurately described by the expression that depends on the speed. On the other hand, for high-speed motion, the drag force is more accurately described by the expression that is proportional to the square of the speed.

Step-by-step explanation:

The expression for the drag force experienced by a moving object in a liquid depends on the speed of the object. For low-speed motion, the drag force is more accurately described by the expression that depends on the speed. This is because at low speeds, the drag force is directly proportional to the speed of the object. On the other hand, for high-speed motion, the drag force is more accurately described by the expression that is proportional to the square of the speed. This is because at high speeds, the drag force increases more rapidly with the square of the speed.