Question
Is work done by a non conservative force always negative? Comment.
✓
Answer
No. For example, work done by a non-conservative force like friction is zero, so long as the body does not start moving. Again when friction causes motion, work done by friction is positive.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
What is the unit of Planck's constant?
At what factor between the two particles gravitational force does not depend?
Two alternating currents are given by, $\text{i}_\text{i}=\text{i}_0\sin\omega\text{t}$ and $\text{i}_\text{i}=\text{i}_0\sin\Big(\omega\text{t}+\frac{\pi}{3}\Big)$ Will the rms values of the currents be equal or different?
→Assume that the total surface area of a human body is $1.6 \mathrm{~m}^2$ and that it radiates like an ideal radiator. Calculate the amount of energy radiated per second by the body if the body temperature is $37^{\circ} \mathrm{C}$. Stefan constant $\sigma$ is $6.0 \times 10^{-}$ ${ }^8 \mathrm{Wm}^{-2} \mathrm{~K}^{-4}$.
→When a particle moves with constant velocity, its average velocity, its instantaneous velocity and its speed are all equal. Comment on this statement.
It is true that the triple-point in a singular point of matter, uses modern thermodynamics. How?
The stress versus strain graphs for two materials $A$ and $B$ are shown below: $($The graphs are to the same scale$)$.
→
- Which material has greater Young's modulus?
- Which material is more ductile?
- Which is more brittle?
Which physical quantity is conserved in simple harmonic motion?
Write the order of following length in metres:
- Radius of earth.
- The height of average man.
- Thickness of sheet of paper.
- The radius of hydrogen atom.
A wheel of moment of inertia $50 \mathrm{~kg}-\mathrm{m}^2$ about its own axis is revolving at a rate of 5 revolutions per second. What is its angular momentum?
→