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Question
Which machine will you use to do the following work? Write their type.
To remove the lid of a tin.
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Solution
To remove the lid of a tin, a tin opener or can opener, which is a second-order lever machine, is used.
RELATED QUESTIONS
Fill in the blank:
The useful work done by an actual machine is always ............ than the work done on the machine.
State if the following statement is true or false. Correct the statement if it is false.
Work done by a machine is always more than the work done on a machine.
What is an inclined plane?
The mechanical advantage of an inclined place is always:
(a) less than 1
(b) equal to 1
(c) greater than 1
(d) nothing can be said
Can a machine be 100% efficient?
Give scientific reason for the following:
Passengers in a bus are pushed backward when it starts suddenly.
Fig. shows a spade. It is being used to lift soil weighing 30N from the ground.
(a) Mark the direction of the least force on the handle necessary to keep the spade balanced.
(b) Calculate the least force on the handle necessary to keep the spade balanced (the weight of the spade is negligible).
(c) If the left hand was move towards the soil on the spade, would the force on the handle necessary to keep the soil balance the greater or less? Give a reason for your answer.
(d) To which class of lever does the spade belong?
What is the efficiency of an ideal machine?
Give an example of the following use of a machine to obtain gain in force.
(i) Calculate the mechanical advantage of the lever shown in the figure.
(ii) How do you define the mechanical advantage of a machine?
