You visited us 1 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard X

Physics

Class 1 Lever When MA<1

In Fig shows ...

Question

In Fig shows a uniform metre rule of weight W supported on a fulcrum at the 60 cm mark by applying the effort E at the 90 cm mark.

(a) State with reason whether the weight W of the rule is greater than, less than or equal to the effort E.

(b) Find the mechanical advantage in an ideal case.

Open in App

Solution

(a)
Let M be load.
∴ Load arm = 90 – 60 = 30 cm
Since wt. of scale will act at centre of gravity of scale which is the midpoint of the scale.
∴ Effort arm = 60 – 50 = 10 cm
Let wt. of scale be W
By principal of moments L × d_L = E × d_E
M × 30 = W × 10
W = 3M
∴ Since weight of scale is three times that of M.
∴ Weight of scale is greater than weight of M.

(b)
MA=efort arm / load arm
=10/30=1/3

Suggest Corrections

Similar questions

Q. Fig., shows a uniform metre scale of weight

W

supported on a fulcrum at the

60 c m

mark by applying the effort

E

at the

90 c m

mark. What is the mechanical advantage in an ideal case ?

The given figure shows a uniform metre rule of weight W supported on a fulcrum at the 60 cm mark by applying the effort E at the 90 cm mark.

Find the mechanical advantage of the lever.

Q. Figure shows a uniform metre rule placed on a fulcrum at its mid-point

O

and having a weight

40 g f

at the

10 c m

mark and a weight of

20 g f

at the

90 c m

mark. Is the metre rule in equilibrium? If not, how will the rule turn?

Fig. 1.33 shows a uniform metre rule placed on a fulcrum at its mid-point O and having a weight 40 gf at the 10 cm mark and a weight of 20 gf at the 90 cm mark. (i) Is the metre rule in equilibrium ? If not, how will the rule turn ? (ii) How can the rule be brought in equilibrium by using an additional weight of 40 gf ?

A uniform metre scale is kept in equilibrium. It is supported at 60 cm mark and a mass M is suspended at 90 cm mark as shown in the figure. What is the relation between the weight of the scale(W) and the weight of mass(M)?

Join BYJU'S Learning Program

Explore more

Class 1 Lever When MA<1

Standard X Physics

Join BYJU'S Learning Program

In Fig shows a uniform metre rule of weight W supported on a fulcrum at the 60 cm mark by applying the effort E at the 90 cm mark. (a) State with reason whether the weight W of the rule is greater than, less than or equal to the effort E. (b) Find the mechanical advantage in an ideal case.

In Fig shows a uniform metre rule of weight W supported on a fulcrum at the 60 cm mark by applying the effort E at the 90 cm mark.

(a) State with reason whether the weight W of the rule is greater than, less than or equal to the effort E.

(b) Find the mechanical advantage in an ideal case.