kindly give me 50 questions on simple machines class 6. Only someone from St. Augustine's day school barrackpore will answer. write your name, class section and roll no too
Answers
Answer:
hey
I am very happy
my name changed
by the way I am Misha
don't get confused
Page No 90:
Question 1:
Classify the following as a lever, a pulley and an inclined plane :
A wedge, a needle, a staircase, a slide, the wheel of a flagpole, nutcrackers, scissors, an opener, an axe, a crane, a knife.
ANSWER:
A wedge: An inclined plane
A needle: An inclined plane
A staircase: An inclined plane
A slide: An inclined plane
The wheel of a flagpole: A pulley
Nutcrackers: A lever
Scissors: A lever
An opener: A lever
An axe: An inclined plane
A crane: A pulley
A knife: An inclined plane
Page No 90:
Question 2:
Fill in the blanks using the proper word and complete the statements.
(a) The ______in the centre, the _____ on one side and the .______on the other side make a lever of the first order.
(b) The _______in the centre, the .________ in one side and the ..______. on the other side make a lever of the second order.
(c) The .______in the centre, the ._____. on one side and the.______on the other side make a lever of the third order.
ANSWER:
(a) The fulcrum in the centre, the load on one side and the effort on the other side make a lever of the first order.
(b) The load in the centre, the fulcrum on one side and the effort on the other side make a lever of the second order.
(c) The effort in the centre, the load on one side and the fulcrum on the other side make a lever of the third order.
Page No 90:
Question 3:
Which machines will you use to do the following work? Write their types.
(a) To remove the lid of a tin.
(b) To lift bricks to the top of a tall building.
(c) To cut vegetables.
(d) To draw water from a well.
(e) To hold a papad for roasting it.
ANSWER:
(a) To remove the lid of a tin, we should use an opener which is a second order lever.
(b) To lift bricks to the top of a tall building, we should use a crane which is a pulley.
(c) To cut vegetables, we should use a knife which is a wedge.
(d) To draw water from a well, we should use a pulley system or wheel-axle.
(e) To hold a papad for roasting it, we should use a tong which is a third order lever.
Page No 90:
Question 4:
Write the answers to the following questions in your own words.
(a) What is meant by simple machines?
(b) Mention the advantages of using a machine.
(c) What is meant by complex machines?
(d) What is a lever ? How are the orders of the lever determined?
ANSWER:
(a) Simple machines are the tools that help people work faster and better. These help us lift heavy loads, change the speed of the motion or the direction of force. Examples are simple machines are knife, nutcrackers etc.
(b) The advantages of using a machine are:
More work can be done in lesser time as well as with great accuracy
Less effort has to be applied to accomplish the task
(c) A machine made up of two or more simple machines is called a complex machine. It consists of different parts that carry out different task and together contribute to the working of the machine. The most common example is that of a bicycle.
(d) A lever is a simple machine consisting of a rigid rod which is capable of turning around a pivot called a fulcrum. It has three parts, namely, effort, load and fulcrum.
Fulcrum: The rod of the lever rests on it and the lever rotates about it.
Load: The weight lifted by the liver is called the load.
Effort: The force applied on the other end of the rod to lift the load is called the effort.
The orders of the lever are determined depending on the position of the effort, the fulcrum and the load.
Lever of first order: When the fulcrum is situated between load and effort, we call it a lever of first order. For example, beam balance, a crowbar, a see-saw.