Advertisements
Advertisements
Question
A 4 m long rod of negligible weight is to be balanced about a point 125 cm from one end and a load of 18 kgf is suspended at a point 60 cm from the support on the shorter arm.
- If a weight W is placed at a distance of 250 cm from the support on the longer arm to balance the rod, find W.
- If a weight 5 kgf is kept to balance the rod, find its position.
- To which class of lever does it belong?
Solution
(a) W × CE = 18 × DC
W × 250 = 18 × 60
∴ W = `(18 xx 60)/250`
∴ W = 4.32 kgf
(b) New W = 5 kgf
Let it be placed at a distance x from C on arm CB
∴ 5 × x = 18 × 60
∴ x = `(18 xx 60)/5`
= 216 cm = 2.16 m
(c) It belongs to class I lever.
APPEARS IN
RELATED QUESTIONS
Which class of lever will always have MA > 1 and why?
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.
Define Lever
The following belong to which class of lever?
Human-arm
The following belong to which class of lever?
A fire tongs
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 diagram below shows a lever in use.
(i) To which class of lever does it belong?
(ii) If FA = 40 cm, AB = 60 cm, then find the mechanical advantage of the lever.
