Question

a) If we measure the force in kgf and the distance covered by a body in metre. What is the unit of work?​

Answer 1

Answer:

I unit of work is Joule. 1 joule of work is said to be done when a force of 1 newton displaces a body through a distance of 1 metre in its own direction. A boy of weight 40 kgf climbs up the 15 steps, each 15 cm high in 10 s and a girl of weight 20 kgf does the same in 5 s.

Answer 2

If we measure the force in kgf, the unit of work will be 9.8 J.

• Force is the physical cause which changes or tends to change either the size, the shape, the state of rest or of motion of a body.
• The S.I. unit of force is Newton (N).
• Distance is the total length of path along which a body moves.
• The S.I. unit of distance is metre (m).
• Work is given by the formula,

        $Work = Force * displacement$

        $J (joule) = N (newton) * m (metre)$

• The S.I. unit of work is J (joule) or N-m (Newton metre).
• The relation between kgf and newton is,

        $1 kgf = 9.8 N$

Therefore, if the force is in kgf (kilogram force), the unit of work would be 9.8 J.