1. The friction force between the box and the floor is caused by the microscopic roughness and irregularities on both surfaces, which interlock and resist relative motion, and the normal force pressing the box against the floor.

    The friction force between the box and the floor is caused by the microscopic roughness and irregularities on both surfaces, which interlock and resist relative motion, and the normal force pressing the box against the floor.

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  2. The box does not move when a small force is initially applied because the applied force is less than the static friction force. Static friction must be overcome for the box to start moving, which requires a greater force.

    The box does not move when a small force is initially applied because the applied force is less than the static friction force. Static friction must be overcome for the box to start moving, which requires a greater force.

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  3. Unbalanced forces affect the motion of an object by causing it to accelerate in the direction of the net force. This can change the object's speed, direction, or both, resulting in a change in its state of motion.

    Unbalanced forces affect the motion of an object by causing it to accelerate in the direction of the net force. This can change the object’s speed, direction, or both, resulting in a change in its state of motion.

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  4. When two opposite forces of different magnitudes pull the wooden block, the block will move in the direction of the larger force. The motion's speed and acceleration depend on the difference in magnitudes, with the net force determining the block's resulting acceleration according to Newton's secondRead more

    When two opposite forces of different magnitudes pull the wooden block, the block will move in the direction of the larger force. The motion’s speed and acceleration depend on the difference in magnitudes, with the net force determining the block’s resulting acceleration according to Newton’s second law.

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  5. Balanced forces are forces of equal magnitude and opposite direction acting on an object, resulting in no change in the object's motion. The net force is zero, so the object remains at rest or continues moving at a constant velocity.

    Balanced forces are forces of equal magnitude and opposite direction acting on an object, resulting in no change in the object’s motion. The net force is zero, so the object remains at rest or continues moving at a constant velocity.

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