Advertisements
Advertisements
प्रश्न
State whether the following statement is True or False.
A machine performs work by itself.
विकल्प
True
False
उत्तर
False
APPEARS IN
संबंधित प्रश्न
Select the correct alternative:
For an ideal machine, the efficiency is
Name six simple machines. Give an example of each machine.
Give an example of the following uses of a machine:
to obtain gain in speed
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)?
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.
Write an expression for the mechanical advantage of an inclined plane.
What is the efficiency of a machine?
Establish a relationship between efficiency, M.A., and V.R.
Classify the following as a lever, a pulley and an inclined plane:
Nutcrackers
Rearrange the letters and find out the name of the tool.
R L E V E
| ______ | ______ | ______ | ______ |
