Which is more reliable—using a manual stop watch or using light gates? Explain.
1 answer:
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Answer:
Because the force one needs to apply is reduced.
Explanation:
- Work can be expressed in terms of force and distance as follows,
Work = Force × distance
- To be more precise, the selection of these two parameters should be in a manner that the distance is what the line of action of the force traces.
- It is obvious that for a given amount of work when one parameter is changed the other changes to counteract the change of the first one.
- Imagine the situation shown in the attached figure. The amount of work that needs to be done during the lifting of the mass to a height of
vertically is
.
- On the slope, however, one needs to push the object an
distance up to get the object to that
height ultimately.
- The work he does on the slope is
and since
,
.
- The force that needs to be applied is less than that applied in the vertical lift. Hence it feels easier. #SPJ4
