Consider a scenario where a bus is moving with a constant speed. A person inside the bus, started pushing the bus from inside. Which of the following statements are true.
Consider a scenario where a bus is moving with a constant speed. A person inside the bus, started pushing the bus from inside. Which of the following statements are true.
The correct options are
A With respect to a person at rest(outside the bus) work is being done by the person pushing the bus.
C With respect to a person in the bus(moving with same speed as that of the bus), no work is being done by the person pushing the bus.
Work done is dependant on frame of reference. Work done is simply the dot product of force and the displacement of point of application of force. So for a person outside the bus, the point of application of force(which here is the contact between the person who is pushing and the bus) is moving with the same velocity as that of the bus. So work is being done. But from the frame of reference of the person inside the bus, the point of application of force is at rest, so no work is being done.
A
With respect to a person at rest(outside the bus) work is being done by the person pushing the bus.
C
With respect to a person in the bus(moving with same speed as that of the bus), no work is being done by the person pushing the bus.
Work done is dependant on frame of reference. Work done is simply the dot product of force and the displacement of point of application of force. So for a person outside the bus, the point of application of force(which here is the contact between the person who is pushing and the bus) is moving with the same velocity as that of the bus. So work is being done. But from the frame of reference of the person inside the bus, the point of application of force is at rest, so no work is being done.
