Question

Numericals in PHYSICS

1. Calculate the amount of load that can be shifted by a single movable pulley if the effort applied is 20 N.
By applying same effort how much load can be shifted using a single fixed pulley ?

2. A uniform seesaw of length 6 m
is supported at its centre. A girl of weight 200 N sits at a distance 2 m
from the centre of the seesaw. A boy of weight X N sits at a distance 1 m
from the centre of the seesaw. Find X.

3. A fire tong has its arms 20 cm long.
It is used to lift a coal of weight 15 N
by applying an effort at a distance of
15 cm from the fulcrum. Find the effort needed.

4. A machine which is 80% efficient
converts 500 joule energy to X joule.
Find the value of X.​

Answer 1

(3) Fire tongs has its arms =20 cm Effort arm = 15 cm Load arm =20 cm (i) Mechanical advantage M.A = Effort arm/Load arm = 15/20 = 0.75 (ii) Effort = Load/M.A = 1.5/0.75 = 2.0 kgf.

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