Pull an object with force F to make it move in a straight line with uniform acceleration on the horizontal plane with acceleration a. the horizontal component of force F is F1, as shown in the figure. If the force F & cent; with the same size and direction as F1 is used to pull the object instead of F to produce acceleration a & cent;, then: (b c) A. When the horizontal plane is smooth, a & cent; < a B. when the horizontal plane is smooth, a & cent; = a C. When the horizontal plane is rough, a & cent; < a D. when the horizontal plane is rough, a & cent; = a D Please explain why when the plane is smooth, a is the same. F1 is obviously less than f, so its horizontal component is also less than f's horizontal component?

The magnitude and direction of F & cent; are the same as that of F 1. Of course, the acceleration is also the same

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