When accelerating, the resultant force acting on it must be equal to zero.
There must always be a non-zero resultant force acting on it.
At a steady velocity, the resultant force acting on it must be equal to zero
At a steady velocity, the air resistance must be equal to zero.
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we should all know that when a body is moving with a uniform velocity, no net force is acting on it , that means the forces acting on one side balances the forces acting on the other siflde.
C is correct
Let's break down each of these statements to see which one holds for a moving object:
A. When accelerating, the resultant force acting on it must equal zero. This is incorrect. Acceleration is defined as a change in velocity (either speed or direction). According to Newton's second law of motion (F = ma), a non-zero net force is required to cause an object to accelerate. If the resultant force were zero, the acceleration would also be zero, and the object would either remain at rest or continue moving at a constant velocity.
B. There must always be a non-zero resultant force acting on it. This is also incorrect. An object can move at a constant velocity (both speed and direction) even if the resultant force acting on it is zero. This is described by Newton's first law of motion (the law of inertia). If all the forces acting on an object are balanced, the resultant force is zero, and the object's velocity remains constant.
C. At a steady velocity, the resultant force acting on it must be equal to zero. This statement is correct. A steady velocity means that both the speed and the direction of the object are constant. According to Newton's first law, an object will continue to move at a constant velocity unless acted upon by a net force. Therefore, if the velocity is steady, the resultant force acting on the object must be zero (all forces are balanced).
D. At a steady velocity, the air resistance must be equal to zero. This is incorrect. Air resistance is a force that opposes the motion of an object through the air. For an object to move at a steady velocity in the presence of air resistance, another force must be acting on it in the opposite direction to balance the air resistance. For example, a car moving at a constant speed on a flat road experiences air resistance, but the engine provides a forward force that counteracts it, resulting in a zero resultant force and thus a steady velocity.
Therefore, the correct statement is C. Thanks
when the velocity of an object is constant, it is not accelerating..hence is at equilibrium. For an object to bw in equilibrium, the eesulatant force must be equal to zero.that makes C the right answer.
