Advertisements
Advertisements
Question
Fill in the blank:
The useful work done by an actual machine is always ............ than the work done on the machine.
Advertisements
Solution
The useful work done by an actual machine is always less than the work done on the machine.
APPEARS IN
RELATED QUESTIONS
What care would you take to increase the life span of a machine which you use?
What do you understand by a simple machine?
The correct relationship between the mechanical advantage (M.A.), the velocity ratio (V.R.) and the efficiency (n) is ______.
What is the efficiency of an ideal machine?
A cook used a ‘fire tong pair’ of length 32 cm. to lift a piece of burning coal of mass 500 g. If he applies his effort at a distance of 8 cm from the fulcrum, what is his effort? Assume friction etc. to be absent. Also, obtain values of the M.A. and the V.R. of this ‘machine’.
Classify the following as a lever, a pulley and an inclined plane:
A staircase
Which machine will you use to do the following work? Write their type.
To lift bricks to the top of a tall building.
Name the levers mentioned in the following passage. Identify the fulcrum, load, and effort of each and say which type of lever it is.
Ravi and Savita sit on a seesaw in a garden. In the meantime, a gardener is trimming trees in the garden. He puts the leaves and other garbage in the wheelbarrow. Later, Ravi gets thirsty and he buys lemon sherbet. The sherbet seller cuts the lemon and squeezes it using a lemon squeezer. He puts small pieces of ice in the glass with the help of the tongs.
Simple machines usually exchange a larger force to move a heavy object.
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.
