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Question
Classify the following as a lever, a pulley and an inclined plane:
An opener
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Solution
An opener – A lever
RELATED QUESTIONS
Answer the following.
What is a machine?
State the kind of lever which always has mechanical advantage less than 1. Draw a labelled diagram of such a lever.
Fig show a system of four pulleys. The upper two pulleys are fixed and the lower two are movable.
(i) Draw a string around the pulleys. Also show the place and direction in which the effort is applied.
(ii) What is the velocity ratio of the system?
(iii) What is the mechanical advantage of the system?
(iv) What assumption do you make in arriving at your answer in part (iii)?
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?
Can a simple machine act as a force multiplier and a speed multiplier at the same time?
What is the efficiency of an ideal machine?
Classify the following as a lever, a pulley and an inclined plane:
A staircase
The ______ in the centre, the ______ on one side and the ______ on the other side make a lever of the third order.
Which machine will you use to do the following work? Write their type.
To cut vegetables.
Why is this so machines have to be maintained?
