Whats the difference between jumping and hitting (kicking) the ground, in both situations the normal force has the same direction, so why when we hit the ground the ground wont push us back, according to f=ma, When we hit the ground there is more force than when we jump also both normal forces have the same direction but still earth doesnt push us back.

  • $\begingroup$ You should look at : physics.stackexchange.com/q/489809/207455 $\endgroup$ – user207455 Jul 5 '19 at 10:25
  • $\begingroup$ Why do you think the ground is not "pushing back"? $\endgroup$ – user207455 Jul 5 '19 at 10:26
  • $\begingroup$ When you jump you move your entire body, but when you hit the ground your body doesnt move. Idk. $\endgroup$ – Zheer Jul 5 '19 at 10:50
  • $\begingroup$ So, jump up and then land with your legs straight and locked. See what you think then... $\endgroup$ – user207455 Jul 5 '19 at 11:05

The ground does push you back when you hit the ground. Try it. Swing your fist at the ground and you'll see it recoil.

Of course you won't experience as large a recoil as when you jump on the ground, but that's because you exert a much larger force when you jump (it's your entire body mass after all).

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  • $\begingroup$ Then why my entire body doesnt move when i hit the ground, but when i jump it does $\endgroup$ – Zheer Jul 5 '19 at 10:51
  • $\begingroup$ Because only the part of your body that's hitting the ground is in contact with it. $\endgroup$ – Allure Jul 5 '19 at 10:52
  • $\begingroup$ When i jump both my legs are in contact with the ground, when i hit the ground both of my legs are hitting the ground, idont see any difference. $\endgroup$ – Zheer Jul 5 '19 at 10:53
  • $\begingroup$ When you hit the ground after jumping, you have speed and momentum. The earth then pushed back on you, but just exactly that much to reduce your speed back to zero. (very simplified) $\endgroup$ – Sentry Jul 5 '19 at 11:01
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    $\begingroup$ @Allure I think the lack of understanding is not us... $\endgroup$ – user207455 Jul 5 '19 at 11:09

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