The "***" is my answer
2.In this pulley system, the pulleys will _____ the mechanical force required to lift the block and will change the _____.
A. decrease; direction of the force
B. increase; direction of force***
C. increase; weight of the block
D. decrease; weight of the block
decrease; direction of the force
What are the answers
The correct answer is: B. increase; direction of force
To determine the correct answer, we need to understand how pulley systems work. In a pulley system, multiple pulleys are used to distribute the mechanical force required to lift an object. The direction of the force is determined by the arrangement of the pulleys.
When multiple pulleys are used, they can either increase or decrease the mechanical advantage of the system, depending on how they are set up. The mechanical advantage is the ratio of the output force to the input force. In this case, the mechanical force required to lift the block refers to the input force, and the change in direction of force refers to the output force.
Now let's analyze the options:
A. decrease; direction of the force - According to our understanding, this option is incorrect as decreasing the mechanical advantage would make it harder to lift the block, rather than easier.
B. increase; direction of force*** - This option is correct. Increasing the mechanical advantage would make it easier to lift the block, and the direction of the force can be changed by the arrangement of the pulleys.
C. increase; weight of the block - This option is incorrect since the weight of the block remains the same regardless of the pulley system used.
D. decrease; weight of the block - This option is incorrect because the weight of the block is a constant and cannot be changed by the pulley system.
Therefore, the correct answer is B. increase; direction of force.