Advertisements
Advertisements
प्रश्न
Which machine will you use to do the following work? Write their type.
To cut vegetables.
Advertisements
उत्तर
To cut vegetables, we should use a knife.
Type: Wedge (simple machine)
संबंधित प्रश्न
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?
Comment on the statement ‘The mechanical advantage of a machine is greater than 1’. Give an example of a lever mechanical advantage is:
(i) greater than 1.
(ii) Equal to 1.
Give an example of the following use of a machine to obtain gain in force.
Establish a relationship between efficiency, M.A., and V.R.
Classify the following as a lever, a pulley and an inclined plane:
A needle
Classify the following as a lever, a pulley and an inclined plane:
The wheel of a flagpole
Why is this so machines have to be maintained?
______ help us to make work easier.
Simple machines makes work easier by trading ______ for force.
