
Explain positive, negative and zero work. Give one example of each.
Answer
528k+ views
2 likes
Hint: Write formula of work . Learn dot product of two forces. For positive work, W should be positive so for this find an angle between force and displacement.
Dot product of two component A and B
Where is the angle between two vectors.
Find for positive W, negative W and zero W.
Complete step by step answer:
The work done by a force on a particle during a displacement is given as
Here, W = work
= force
= displacement
Positive work done – The work done is said to be positive when force and displacement are in the same direction.
Hence, work is positive.
Zero work – the work done is said to be zero when force and displacement are perpendicular to each other.
Hence, work is zero
Negative work done – The work done is said to be negative when force and displacement are in opposite directions.
Hence, work is negative.
Note: Work done by friction is always zero because friction force and displacement act in opposite directions. When a spring travels from A to B and from B back to A then work done during the return journey is negative of the work during the onwards journey and the net work done by the spring is zero.
Dot product of two component A and B
Where
Find
Complete step by step answer:
The work done by a force on a particle during a displacement is given as
Here, W = work
Positive work done – The work done is said to be positive when force and displacement are in the same direction.

Hence, work is positive.
Zero work – the work done is said to be zero when force and displacement are perpendicular to each other.
Hence, work is zero

Negative work done – The work done is said to be negative when force and displacement are in opposite directions.

Hence, work is negative.
Note: Work done by friction is always zero because friction force and displacement act in opposite directions. When a spring travels from A to B and from B back to A then work done during the return journey is negative of the work during the onwards journey and the net work done by the spring is zero.
Latest Vedantu courses for you
Grade 9 | CBSE | SCHOOL | English
Vedantu 9 CBSE Pro Course - (2025-26)
School Full course for CBSE students
₹37,300 per year
Recently Updated Pages
Master Class 11 Business Studies: Engaging Questions & Answers for Success

Master Class 11 Economics: Engaging Questions & Answers for Success

Master Class 11 Accountancy: Engaging Questions & Answers for Success

Master Class 11 Computer Science: Engaging Questions & Answers for Success

Master Class 11 Maths: Engaging Questions & Answers for Success

Master Class 11 English: Engaging Questions & Answers for Success

Trending doubts
Difference Between Prokaryotic Cells and Eukaryotic Cells

1 ton equals to A 100 kg B 1000 kg C 10 kg D 10000 class 11 physics CBSE

One Metric ton is equal to kg A 10000 B 1000 C 100 class 11 physics CBSE

1 Quintal is equal to a 110 kg b 10 kg c 100kg d 1000 class 11 physics CBSE

Net gain of ATP in glycolysis a 6 b 2 c 4 d 8 class 11 biology CBSE

Give two reasons to justify a Water at room temperature class 11 chemistry CBSE
