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प्रश्न
Give an example of the following uses of a machine:
to obtain gain in speed
उत्तर
Gears are used to multiply speed
APPEARS IN
संबंधित प्रश्न
When is work said to be done by a force?
Define the term ‘work input’ and ‘work output’ in relation to a machine.
What is an inclined plane?
Define Velocity Ratio
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?
Classify the following as a lever, a pulley and an inclined plane:
A needle
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 lift bricks to the top of a tall building.
Which machine will you use to do the following work? Write their type.
To cut vegetables.
Name a machine for each of the following uses:
- to multiply the force,
- to change the point of application of force,
- to change the direction of force,
- to obtain the gain in speed.
