Advertisements
Advertisements
प्रश्न
What is an ideal machine?
Advertisements
उत्तर
A machine in which no part of the work done on the machine is wasted is called an ideal or perfect machine. Thus, for an ideal machine, the work output is equal to the work input, i.e., the efficiency of an ideal machine is 1 (or 100 percent).
APPEARS IN
संबंधित प्रश्न
State whether the following statement is True or False.
A boy does work while pushing a wall.
Can a machine have an efficiency of 100%? Give a reason to support your answer.
Answer the following.
What do you understand by a complex machine?
show a nut cracker In the diagram, mark the position of the fulcrum F and the line of action of load L and effort E .

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)?
Classify the following as a lever, a pulley and an inclined plane:
Nutcrackers
Classify the following as a lever, a pulley and an inclined plane:
An opener
______ help us to make work easier.
Rearrange the letters and find out the name of the tool.

R L E V E
| ______ | ______ | ______ | ______ |
Simple machines makes work easier by trading ______ for force.
