Question

If a body moves along a frictionless horizontal surface its weight:

• A. Does work
• B. Does not work
• C. Work partially
• D. None of these

Answer 1

The correct option is B Does not work

Work done by the force of gravity on an object (weight) depends on vertical displacement.

Vertical displacement, $h=0$

Mass, $m$

Acceleration due to gravity, $g$

Work done, $W=mgh$

$W=mg\times 0$

$W=0J$

$\therefore$ If a body moves along a frictionless horizontal surface its weight does not work.