Advertisements
Advertisements
Question
Name a machine to obtain gain in speed ?
Advertisements
Solution
To obtain gain in speed: when a pair of scissors is used to cut the cloth, its blades move longer on cloth while its handles move a little.
RELATED QUESTIONS
Write down a relation expressing the mechanical advantage of a lever.
Fig 3.17 below shows a lever in use.
(a) To which class of lever does it belong?
(b) If FA = 80 cm, AB = 20 cm, find its mechanical advantage.
(c) Calculate the value of E.
A lever of length 9 cm has its load arm 5 cm long and the effort arm is 9 cm long.
- To which class does it belong?
- Draw a diagram of the lever showing the position of fulcrum F and directions of both the load L and effort E.
- What is the mechanical advantage and velocity ratio if the efficiency is 100%?
- What will be the mechanical advantage and velocity ratio if the efficiency becomes 50%?
The following belong to which class of lever?
An oar of a boat
The following belong to which class of lever?
Pliers Tools
The following belong to which class of lever?
A pair of scissors
The following belong to which class of lever?
Wheelbarrow
The following belong to which class of lever?
Knife
The following belong to which class of lever?
Fore-arm
Draw a labelled sketch of a second class lever. Give one example of such a lever.
