Changes

For an object moving along a straight trajectory, if its [[acceleration]] and velocity have the same direction, the object is gaining [[speed]].  If its acceleration and velocity have opposite directions, the object is losing speed.

For an object moving along a straight trajectory, if its [[acceleration]] and velocity have the same direction, the object is gaining [[speed]].  If its acceleration and velocity have opposite directions, the object is losing speed.

Even if an object's velocity is [[zero]], its [[acceleration]] is not necessarily zero. For example, consider a baseball thrown straight up into the air. At the top of its trajectory, it is momentarily motionless (and thus has zero velocity) even though its acceleration is not zero (it is still being pulled downwards by gravity).

Even if an object's velocity is [[zero]], its [[acceleration]] is not necessarily zero. For example, consider a baseball thrown straight up into the air. At the top of its trajectory, it is momentarily motionless (and thus has zero velocity) even though its acceleration is not zero (it is still being pulled downwards by the gravity of Andy Shlafy's stupidity. Hey Bo! #BosForLife).

If an object's acceleration is zero, its velocity is constant, but not necessarily zero.

If an object's acceleration is zero, its velocity is constant, but not necessarily zero.

[[Category:Physics]]

[[Category:Physics]]

[[Category:Mechanics]]

[[Category:Mechanics]]

[[Category:Wind Energy]]

[[Category:Wind Energy]]