Simple Machine ( Machine We Use ) - Class 5 Science - New St. Mery English School

In our daily life, we do many tasks like lifting heavy objects, cutting things, opening a bottle, or drawing water from a well. Some of these tasks are hard to do using only our hands. To make our work easier and faster, we use simple machines.

Simple machines are tools that help us do work with less effort. They do not change the amount of work done, but they make work easier by changing the direction or size of the force. Examples of simple machines include the lever, pulley, wheel and axle, inclined plane, screw, and wedge.

Simple Machine ( Machine We Use ) - Class 5 Science - New St. Mery English School

 1-What is force?

Ans:- The push or pull of an object is called force. It is a physical quantity that can change the  speed, state, direction and dimension of an object.

2-How many types of force?

Ans:- There are four types of force
1- Muscular force
2- Gravitational force
3- Magnetic force
4- Friction force

3-What is Muscular force?

Ans:- The force which is exerted by muscles of the body is called muscular force.
Ex:- running, walking, lifting etc. 

4-What is Gravitational force?

Ans:- Gravitational force is a force that attracts a body towards the centre of the earth or towards any other physical body having mass.

Ex:- leaves and fruits fall from a tree downwards towards the ground due to the gravitational force.

5-What is magnetic force?

Ans:- The force exerted between two magnets or a magnet and a magnetic material is called magnetic force.

6-What is friction force?

Ans:- Friction force is the force that generated when two surfaces rub against one another. It is the force which oppose the relative motion between the two surface that are In contact with each other.

7-What is energy?

 

Ans:- The ability to do work is called energy.

8-Write two uses of light energy?

Ans:-  Light energy helps us to see things.
           Plants use light energy to make food 

9-Write two uses of heat energy?

 

Ans:- Heat energy is used to cook food.
          Heat energy is used to change water to steam.

10-What is the use of electric energy?

 

Ans:- Electric energy is used to run washing machine, refrigerator, fan, iron. It is also used in running train and in industries.

11-What is machine?

Ans:- Anything that makes our work easier and faster by reducing the force is called machine. It helps us to do a great deal of work with less effort.

12:- Write three advantage of machines?

Ans:- The three advantages of machines are
1- Machines help us to do work easily and with less effort.
2- machines help us to do work in less time.
3- Machines make our life easy and comfortable.

13-How many types of machine?

Ans:- There are two types of machine.
1- Simple machine
2- Complex machine

14-What is Simple machine?

Ans:- The devices which have moving or no moving parts that are used to modify motion and the magnitude of force in order to perform work is called simple machine.

15-How many types of simple machine?

Ans:- There are six types of simple machine.
1- lever
2- inclined plane
3- wedge
4- screw
5- wheel and axel
6- pulley

16-What is fulcrum?

 

Ans:- A fixed point around which a lever move is called fulcrum.

17-What is load?

 Ans:- The weight that is to be lifted by the lever is called load.

18-What is effort?

Ans:- The force that is applied on the lever is called the effort.

19-What is load arm?

 

Ans:- The arm between the load and fulcrum is called load arm.

20-What is effort arm?

 Ans:- The arm between the effort and fulcrum is called effort arm.

21-What is lever?

 Ans:- A simple machine that is made of a rod and a fulcrum and it is free to move through a fixed point called fulcrum is called lever.

22-How many types of lever?

 

Ans:- There are three types of lever
1- class 1 lever or (first class lever)
2- class 2 lever or (second class lever)
3- class 3 lever or (third class lever)

23-What is class 1 lever?

 

Ans:- The lever in which the fulcrum is between the load and the effort is called class 1 lever.
Ex- seissors, see-saw, pliers

24-What is class 2 lever?

 

Ans:- The lever in which the load is between the fulcrum and the effort is called class 2 lever.
Ex- Bottle opener, Nut cracker etc.

25-What is class 3 lever?

 Ans:- The lever in which the effort is between the fulcrum and the load is called class 3 lever.
Ex- tweezer, fishing rod, broom, arm etc.

26-What is pulley?

 Ans:- A pulley is a device consisting of a grooved wheel over which a rope or a chain is pulled in order to lift heavy objects. A single fixed pulley does not increase or decrease force. It simply changes the direction of the force.

27-How many types of pulley?

Ans:-  There are four types of pulley.
1- fixed pulley
2- movable pulley
3- Compound system pulley
4- Complex system pulley 

28-What is wheel and axle?

 

Ans:- The wheel and axle is a simple machine having a wheel and an axel. The wheel is attached to the axle so that the force is transferred from one to another

29-What is inclined plane?

Ans:-  An inclined plane is a rigid sloping surface over which heavy loads can be raised or lowered to a certain height or depth. Steeper the inclined plane, greater will be the effort required to push up the load.
Ex:- sloping ramps, flyovers, roads on hills, etc.

30-Write two advantages of inclined plane.

 

Ans:- The two advantages of inclined plane are
1- Inclined plane is used to load heavy things on trucks.
2- Inclined plane is used in hospital as ramp to carry patients.

31-What is wedge?

Ans:- A wedge is double inclined plane. It is made up of two inclined planes joined together in such a way that sharp edge is formed.
Ex:- a knife, an axe, etc.

32-What is screw?

 

Ans:- A screw is a simple machine that appears like an inclined plane which have a wounded thread around a rod with a pointed tip.

33-What is thread?

 Ans:-The winding edge around the screw is called thread.

34-What is screw driver?

 

Ans:- A device that is used to screwed the screw into wood is called screw driver.

What is Complex Machine?

Ans:- A combination of two or more simple machine that work together is called complex machine.

Ex:- cart, cycle etc.

Write five things That we should follow while handling machine

Ans:- The five things That we should follow while handling machine are

1- Take care as moving parts of machine can cause injury.

2- Stay away from the place where heavy loads are being lifted by pulleys.

3- Machine parts should be lubricated time to time.

4- Hold sharp objects away from your body.

5- Always store tools in tool box to keep them and yourself safe.