The threads of a screw are an inclined plane wrapped around a post. How does a screw make the work of fastening two objects together easier?

Question

anonymous · Answer

A.
The screw changes the direction of a force - it converts linear force into rotational force. It also reduces the force required - the closer the threads, the smaller the input force required to get the same output force.
 
 B.
The screw changes the direction of a force - it converts rotational force into linear force. It also reduces the force required - the closer the threads, the smaller the input force required to get the same output force.
 
 C.
The screw changes the direction of a force - it converts linear force into rotational force. It also reduces the force required - the closer the threads, the larger the input force required to get the same output force.
 
 D.
The screw changes the direction of a force - it converts rotational force into linear force. It also reduces the force required - the closer the threads, the larger the input force required to get the same output force.

anonymous · Answer

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