1
= 1
{scope}
\b[Original question.]
Define a \i[lever], and state its mechanical advantage. Into what classes have straight levers been divided ? Describe the mechanism by which the human arm is bent and extended.
= 1
{scope}
\b[Original question.]
Define a \i[lever], and state its mechanical advantage. Into what classes have straight levers been divided ? Describe the mechanism by which the human arm is bent and extended.