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) it's Newton's third law of action and reaction

2) a> Parasitic drag- a drag that results when an object is moved through a fluid medium.

b> lift-induced drag (drag due to lift), is an aerodynamic drag force that occurs whenever a moving object redirects the airflow coming at it.

3) to reduce the surface drag. they minimize the friction that could be caused by the presence of obstacles like hair or fur.

4) drag is proportional to the square of the velocity.

so, earlied drag was constant*62

after that drag would become constact*182

hence the drag ratio would be constant*6*6/(constant*18*18) = 1/9

Hence the drag in later time would be 9 times.

5) the air that is coming cause a lot of drag, so backing behind makes them feel less air drag as the person front to him is facing the air first. So, this way the person at the has to put lesser effort the maintain the same speed.

6) not sufficient info. #15?? NOT CLEAR

7) no image shown, the only link is there. NOT CLEAR

8) what is #17?? NOT CLEAR

Answer to second last question: To lower the center of gravity. this was the can carry it easily to the destined point.

Last qhestion: Preparation , Observation, Evaluation and Diagnosis, Intervention

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