Physics
Derive a relationship between mechanical advantage, velocity ratio and efficiency of a machine.
Machines
85 Likes
Answer
Suppose a machine overcomes a load L by the application of effort E.
Let,
the displacement of effort = dE and
the displacement of the load = dL in time t.
But we know that,
and
Substituting the above two values in the formula for efficiency we get
Hence, the mechanical advantage of a machine is equal to the product of its efficiency and velocity ratio.
Answered By
45 Likes
Related Questions
Draw a diagram of a lever which is always used as a force multiplier. How is the effort arm related to the load arm in such a lever?
Explain why scissors for cutting cloth may have blades longer than the handles, but shears for cutting metals have short blades and long handles.
Figure shows a uniform metre rule of weight W supported on a fulcrum at the 60 cm mark by applying the effort E at the 90 cm mark.
(a) State with reasons whether the weight W of the rule is greater than, less than or equal to the effort E.
(b) Find the mechanical advantage in an ideal case.
Which type of lever has a mechanical advantage always more than 1? Give reason with one example. What change can be made in this lever to increase its mechanical advantage?