Advertisements
Advertisements
प्रश्न
Give an example of the following use of a machine to obtain gain in force.
उत्तर
Lifting a car with a jack.
APPEARS IN
संबंधित प्रश्न
Fill in the blank:
The useful work done by an actual machine is always ............ than the work done on the machine.
Select the correct alternative:
For an ideal machine, the efficiency is
Define the term ‘work input’ and ‘work output’ in relation to a 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 do you understand by a simple machine?
Give two examples of inclined plane where it is used to raise a heavy load with less effort ?
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?
Establish a relationship between efficiency, M.A., and V.R.
Classify the following as a lever, a pulley and an inclined plane:
An opener
Which machine will you use to do the following work? Write their type.
To cut vegetables.
