Final answer:
In procedure 2, the block should move at a constant speed because `No friction in procedure 2`
The answer is option ⇒2
Step-by-step explanation:
Here's why:
1. Friction: Friction is a force that opposes the motion of objects in contact. When there is friction present, it can cause the block to slow down and eventually come to a stop if the force applied is not enough to overcome the frictional force.
2. No friction in procedure 2: In this scenario, since it is stated that there is no friction, there is no opposing force acting on the block. Without friction, there are no forces hindering the block's motion, allowing it to move freely without any external resistance.
3. Balanced external forces: The absence of friction means that there are no additional external forces acting on the block. In this case, if the force applied to the block is constant and there are no other external forces, the block will continue to move at a constant speed in a straight line, as described by Newton's first law of motion.
4. Variable force: If a variable force were applied, the block's speed would not remain constant. A variable force would result in an acceleration or deceleration of the block, leading to a change in its speed over time. However, in procedure 2, the question specifically states that the block should move at a constant speed, indicating that the force applied is constant.
Therefore, option 2, "No friction in procedure 2," explains why the block should move at a constant speed.
The answer is option ⇒2