Question

When is work done positive, negative and zero
pls solve this fast

Answer 1

POSITIVE WORK :the work done on an object is said to be positive work when force and displacement are in same direction.
example: When an object moves on horizontal surface,force and displacement acts in forward direction. So,work done is positive.
NEGATIVE WORK:The work done is said to be negative work when force and displacement are in opposite direction.
example: When an object is thrown upwards,the force CTS in downward direction whereas displacement acts in upward direction.
ZERO WORK:The work done is said to be zero work when force and displacement are perpendicular to each other or when either force or displacement is zero.
example: When we hold an object and walk,the force acts in downward direction whereas displacement acts in forward direction.

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Answer 2

POSITIVE - if the force has a component in the same direction as the displacement of the object, the force is doing positive work.
NEGATIVE - If the force has a component in the direction opposite to the displacement, the force does negative work.
ZERO - work done is zero when the direction is perpendicular

Hope it will helpful to you!!!!!