even if drag force i.e air resistance is greater in magnitude as compared to other force ,there will be no motion in the direction of drag force, right?motion will be still in direction of that 'other force 'but as it is less than drag force there will be deceleration ,am i right?
That depends
If you are in an car:
If it is taking off from a stop light and accelerating forward then Thrust is greater than Drag
If it is cruising along at constant velocity then Thrust forward equals drag back
If you take your foot off the gas and coast then Thrust becomes LESS than drag and you slow down. Net force (Thrust - Drag) is back (negative) but motion is still forward.
Yes, you are correct. When the drag force is greater in magnitude than the other force (such as a propulsive force), there can still be motion in the direction of the other force, but it will be decelerated due to the greater opposing force of drag.
To understand why, it's important to know that drag force is a resistive force experienced by an object moving through a fluid (such as air). It is proportional to the speed of the object and acts in the opposite direction of motion.
When the drag force is greater in magnitude than another force (e.g., a propulsive force), the net force acting on the object is in the direction opposite to that of the other force. As a result, the object experiences deceleration.
However, depending on the specific conditions and magnitudes of forces involved, the motion might not completely cease in the direction of the drag force. For example, if the propulsive force is still greater than the drag force, the object may continue to move in the direction of the propulsive force but with a reduced velocity.
In summary, when drag force is greater than another force, there will be deceleration in the direction of the other force, but the object may still experience some residual motion in that direction if the other force is not completely overcome by drag.