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The net force acting is not zero on...

The net force acting is not zero on

A

A retarding train

B

A ball falling with terminal velocity

C

A kite held stationary

D

A truck moving with constant velocity

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding which scenario has a net force that is not zero, we will analyze each option provided in the question. ### Step-by-Step Solution: 1. **Understanding Net Force**: - The net force acting on an object is the vector sum of all the forces acting on it. If the net force is zero, the object is either at rest or moving with a constant velocity (Newton's First Law). 2. **Analyzing Each Option**: - **Option A: Retarding Train**: - A retarding train is one that is decelerating. This means that there is a net force acting in the opposite direction to the motion of the train, resulting in a negative acceleration. Therefore, the net force is not zero. - **Option B: Ball Falling with Terminal Velocity**: - When an object falls with terminal velocity, the forces acting on it (gravity and drag) are balanced. This means the net force is zero, and the object moves with constant velocity. - **Option C: Kite Stationary**: - A stationary kite experiences forces (like tension and gravity) that are balanced. Hence, the net force is zero. - **Option D: Truck Moving with Constant Velocity**: - A truck moving at constant velocity has no change in speed or direction, which means the net force acting on it is zero. 3. **Conclusion**: - From the analysis, we see that the only scenario where the net force is not zero is the retarding train (Option A). In all other scenarios (terminal velocity, stationary kite, and constant velocity truck), the net force is zero. ### Final Answer: The net force acting is not zero on **A: Retarding Train**.
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