Advertisements
Advertisements
Question
Is it possible that an object is in a state of accelerated motion due to external force acting on it, but no work is being done by the force? Explain it with an example.
Advertisements
Solution
Yes, it is possible that an object is in a state of accelerated motion due to external force acting on it, but no work is being done by the force.
For example, an object moving in a circular path due to centripetal force acting on it.
At any instant of time, a constant acceleration due to the centripetal force act on the object along the radius towards the centre while the direction of displacement is tangential to the circle. That is, force and displacement are perpendicular to each other and hence no work is being done.
APPEARS IN
RELATED QUESTIONS
What are the various energy transformations that occur when you are riding a bicycle?
State the energy changes in the following case while in use:
A ceiling fan
State the energy changes in the following while using a microphone.
Fill in the blank
Green plants convert _________ energy into chemical energy.
State the energy changes that occur in the following :
Burning coal while operating a steam engine.
Energy can exist in several forms and may change from one form to another. State the energy changes that occur in the Charging of a battery.
Energy can exist in several forms and may change from one form to another. State the energy changes that occur in the burning of a match stick.
Avinash can run with a speed of 8 m s–1 against the frictional force of 10 N, and Kapil can move with a speed of 3 m s–1 against the frictional force of 25 N. Who is more powerful and why?
Four men lift a 250 kg box to a height of 1 m and hold it without raising or lowering it.
(a) How much work is done by the men in lifting the box?
(b) How much work do they do in just holding it?
(c) Why do they get tired while holding it? (g = 10 m s–2)
The energy conversion in a washing machine is from ______.
