Advertisements
Advertisements
Question
Define the term ‘work input’ and ‘work output’ in relation to a machine.
Advertisements
Solution
Work input is work done on a machine equal to the effort force times the distance through which the force is applied.
Work output is work that is done by a machine and equals resistance force times the distance through which the force is applied.
For an ideal machine, the work output is equal to the work input, i.e., the efficiency.
APPEARS IN
RELATED QUESTIONS
Name six simple machines. Give an example of each machine.
What is an ideal machine?
The diagram below shows a wheel barrow. Mark position of fulcrum F and draw arrows to show the directions of load L and effort E. What class of lever is the whell barrow? Give one more example of the same class of lever.
Give an example where a machine is used to obtain gain in speed.
Give an example of the following use of a machine to change the point of application of the force.
What is the efficiency of a machine?
(i) Calculate the mechanical advantage of the lever shown in the figure.
(ii) How do you define the mechanical advantage of a machine?
Classify the following as a lever, a pulley and an inclined plane:
A wedge
Classify the following as a lever, a pulley and an inclined plane:
A knife
The idea of a simple machine originated with the Greek philosopher Archimedes.
