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The upward force is drag.
The downward force acting on an object in free fall is Gravity.
Gravity will speed up a force if gravity acts in the same direction as the object is already moving - for example, if the object is already moving downward - and if counterforces (such as air resistance) don't interfere too much.
Without context, one can only assume that gravity is exerting a force on any object that is moving downward. (Gravity is still exerting a force on a coin that is not moving, for example one stationary on a tabletop, but we don't spend a lot of time worrying about it.)
The downward force exerted on an object is caused by gravity (from the Earth). This force is called weight and can be calculated by multiplying the mass of the object by the acceleration due to gravity on Earth (about 9.8).
If the object is moving at a constant speed, the net force on it is 0. So the upward force would have to be equal to the downward force (namely the weight of the object).
Friction. Opposing Force
The upward force is drag.
The downward force acting on an object in free fall is Gravity.
air resistance
air resistance
Gravity will speed up a force if gravity acts in the same direction as the object is already moving - for example, if the object is already moving downward - and if counterforces (such as air resistance) don't interfere too much.
The force that causes objects to move downward is gravity
Yes, of course. If it is accelerating, it follows directly from Newton's Second Law that there is a net force acting on the object.
Without context, one can only assume that gravity is exerting a force on any object that is moving downward. (Gravity is still exerting a force on a coin that is not moving, for example one stationary on a tabletop, but we don't spend a lot of time worrying about it.)
By applying a force in the relevant direction against the object.
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