Components of the acceleration vector in projectile motion (3-11)

Question 1 of 4

Question

$x$ component of the acceleration vector $\boldsymbol{\vec{a}}$ for projectile motion

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Question

$y$ component of the accleration vector $\vec{a}$ for projectile motion

{"title":"x component of the acceleration vector a for projectile motion","description":"Incorrect","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"rect\",\"coords\":\"110,46,137,71\"},{\"shape\":\"poly\",\"coords\":\"82,133\"}]"} {"title":"zero value means that the x component of the velocity is constant","description":"Incorrect","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"189,5,222,55\"}]"} {"title":"y component of the acceleration vector a for projectile motion","description":"Correct!","type":"correct","color":"#333300","code":"[{\"shape\":\"poly\",\"coords\":\"113,132\"},{\"shape\":\"rect\",\"coords\":\"109,164,138,192\"}]"} {"title":"elapsed time for the time interval","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"257,45,282,70\"},{\"shape\":\"rect\",\"coords\":\"251,130,282,159\"}]"} {"title":"constant negative value means that the y component of the velocity is always decreasing, and decreases at a steady rate","description":"Incorrect","type":"incorrect","color":"#FF6600","code":"[{\"shape\":\"rect\",\"coords\":\"207,132,242,179\"}]"}

Question

Zero value means that the $x$ component of the velocity is constant

{"title":"x component of the acceleration vector a for projectile motion","description":"Incorrect","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"rect\",\"coords\":\"110,46,137,71\"},{\"shape\":\"poly\",\"coords\":\"82,133\"}]"} {"title":"zero value means that the x component of the velocity is constant","description":"Correct!","type":"correct","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"189,5,222,55\"}]"} {"title":"y component of the acceleration vector a for projectile motion","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"poly\",\"coords\":\"113,132\"},{\"shape\":\"rect\",\"coords\":\"109,164,138,192\"}]"} {"title":"elapsed time for the time interval","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"257,45,282,70\"},{\"shape\":\"rect\",\"coords\":\"251,130,282,159\"}]"} {"title":"constant negative value means that the y component of the velocity is always decreasing, and decreases at a steady rate","description":"Incorrect","type":"incorrect","color":"#FF6600","code":"[{\"shape\":\"rect\",\"coords\":\"207,132,242,179\"}]"}

Question

Constant negative value means that the $y$ component of the velocity is always decreasing, and decreases at a steady rate.

{"title":"x component of the acceleration vector a for projectile motion","description":"Incorrect","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"rect\",\"coords\":\"110,46,137,71\"},{\"shape\":\"poly\",\"coords\":\"82,133\"}]"} {"title":"zero value means that the x component of the velocity is constant","description":"Incorrect","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"189,5,222,55\"}]"} {"title":"y component of the acceleration vector a for projectile motion","description":"Correct!","type":"correct","color":"#333300","code":"[{\"shape\":\"poly\",\"coords\":\"113,132\"},{\"shape\":\"rect\",\"coords\":\"109,164,138,192\"}]"} {"title":"elapsed time for the time interval","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"257,45,282,70\"},{\"shape\":\"rect\",\"coords\":\"251,130,282,159\"}]"} {"title":"constant negative value means that the y component of the velocity is always decreasing, and decreases at a steady rate","description":"Correct!","type":"correct","color":"#FF6600","code":"[{\"shape\":\"rect\",\"coords\":\"207,132,242,179\"}]"}

Review

We use the $x$ and $y$ axes to define the plane in which the projectile moves, with the positive $x$ axis pointing in a horizontal direction and the positive $y$ axis pointing vertically upward. Because the constant acceleration vector $\vec{a}$ points vertically downward and has magnitude $g$ , the components of $\vec{a}$ are: