Question

Explain that work done is said to be positive,negative and zero

Answer 1

Answer:

If the angle between the force and displacement is 90°, then the work done is zero.

If the angle between the force and displacement is 180°-270°,the work done is said to be negative.

If the angle between the force and displacement is 0°-89°, then the work done should be positive.

Answer 2

${\underline{\purple{\textrm{Ƥσsɪᴛɪᴠᴇ ,ɴᴇɢᴀᴛɪᴠᴇ ᴀɴᴅ ᴢᴇʀᴏ ᴡᴏʀᴋ ᴅᴏɴᴇ :}}}}$

Positive work done :

• work done is positive When a force acts in the direction of motion of the body.

Negative work done :

• work done is negative when force acts opposite to the direction of motion of the body.

Zero work done :

• work done is zero when force acts at right angle to the direction of motion of the body.

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