The answer to your question is: The factor contributed to the fall of the Han Dynasty Roman empire and Abbasid empire is the invasion of the nomandic people and other colonizers especially that the Rome has expanded and too large.
Answer:
Friction
Explanation:
Friction is one of the important phenomenon in the daily life. With the help of friction we can walk, stand ,run and many more work which we can do with the help of it.
so, when athlete is running it apply force on to the ground normal force act on the ground because of the friction presence.
then the opposite reaction applied from the ground allows the athlete to move forward.
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