When we generate as much force as possible to kick a starting block on a track,

Question

When we generate as much force as possible to kick a starting block on a track, the starting block also kicks us at the same strength of force to move us forward. According to the Newton’s law, what is this described as?

Fluid drag forces are classified into _______ and _______.

Among the two types of fluid drag forces in #11, which of them is more significant obstacle to our performance?

Competitive swimmers often shave their body hair before the race. Also, we have never seen ski jumpers wear an animal fur coat in the race. Choose the best explanation of why they do so from the following – a) to reduce profile drag, b) to reduce surface drag, c) to control acceleration, or d) to minimize reaction.

Erica went to bike riding this morning. She was initially biking comfortably at 6 miles per hour, but later sped up to 18 miles per hour. Compared to biking at 6 miles per hour, how many more times of drag was she experiencing when she was at 18 miles per hour?

When we watch a marathon race or long-distance bike race (e.g., Tour de France), we often see some racers “hiding” themselves behind others on purpose. What is this technique called?

Continuing from #15 above, choose the best explanation of why they use the technique from the following – a) to recruit more Type I fibers, b) to minimize inertia, c) to save energy cost, or d) to maintain a good line of gravity.

The two factors to better maintain balance are ______ and _______.

Based on the two factors of #17 above, rank the following postures A, B, and C in an order of the worst balance stability to the best balance stability. (Answer like A-B-C, C-B-A, etc.)

B C A

Tightrope walkers typically carries a long bar at a horizontal level. What is an advantage of doing so for tightrope walkers? Choose the best answer from the following – a) better concentration, b) preventing acceleration, c) lowering the center of gravity (mass), and d) better aerodynamics.

Name the four stages of qualitative analysis of human motion.

Explanation / Answer

1). This is stated in Newton's Third Law of Motion.

2). (i). Surface Drag: Is the drag caused due to the friction of the fluid against the surface of the object.

(ii). Profile Drag: is the drag force which is due to turbulence of the fluid and will be absent if the fluid is non-viscous.

3). Since Surface drag force is directly opposite to the velocity of the object hence it is more significant obstacle to the performance in the fluid.

4). Correct option: b). To reduce surface drag.

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