Question

2) A villager uses an old rusty pulley to draw water from a well. If the weight of the bucket with water is 80N
and the effort applied by him is 100N, state:
a) whether the pulley (machine) is an ideal or a practical a machine
b) the relation between mechanical advantage and its velocity ratio.
c) the function of the pulley (machine)

Answer 1

1) practical

3) force multipler

Answer 2

Given:

Weight of bucket filled with water is 80$N$

Force applied on bucket is 100$N$

To Find:

Whether pulley is ideal or practical machine

Relation between mechanical- advantage & its velocity ratio

Function of pulley

Solution:

Answer of first question is pulley is practical machine because its efficiency less than ideal -machine

Answer of second question-

To find mechanical advantage

Weight of water = 80$N$

Force applied on bucket= 100$N$

Mechanical -advantage = Weight of bucket (Load)/ Force

 $= \dfrac{80}{100} = 0.8$

Velocity-ratio is ratio of distance between travelled by load& by force applied.

Relation between mechanical- advantage & velocity- ratio is called efficiency

Answer of third question - Function of pulley- to make the heavy object move.