Force and Motion Note Class 6

 

Force and Motion

Page no. 195

Very short questions

1.      What is force?
Force is an external factor that changes or tries to change the position of a body.

2.      Give an example of force.
An example of force is pushing a door.

3.      How does force affect objects?
Force affects objects by changing their shape, size, direction, speed, etc.

4.      What are the types of forces?
The types of forces are contact forces and non-contact forces.

5.      What is the SI unit of force?
The SI unit of force is Newton (N).

6.      What is motion?
Motion is the change in the position of a body with respect to a fixed point in its surroundings.

7.      Name the type of motion shown in the figure.
(चित्र बनाऊ)
The type of motion shown in the figure is rotatory motion.

8.      What is simple machine?
A simple machine is a device that is simple in structure and makes our work easier and faster.

9.      Name any two simple machines.
The two simple machines are lever and pulley.

10.   What is transformation of force?
Transformation of force is the process of changing the direction or magnitude (size) of a force to make work easier.

11.   What is translatory motion?
Translatory motion is the motion in which a body moves from one place to another in a straight line or along a curved path.

12.   Give two examples of oscillatory motion.
Two examples of oscillatory motion are pendulum and swing.

13.   Give an example of a simple machine used for lifting.
An example of a simple machine used for lifting is pulley.

14.   How do simple machines make tasks easier?
Simple machines make tasks easier by reducing human effort.

15.   Name any two simple machines used at home.
Two simple machines used at home are knife and pliers.

Short questions

1.      Write two effects of force?
The two effects of force are:
i) Force can change the position of a body.
ii) Force can change the speed of a moving body.

2.      How does force affect the shape of an object?
Force can change the shape and size of an object by squeezing or stretching it. For example, squeezing a sponge makes it smaller.

3.      Explain how force can change the direction of an object.
Force can change the direction of a moving object by pushing or pulling it. For example, kicking a football changes its direction.

4.      How does lubrication reduce the friction between surfaces?
Lubrication forms a thin layer between two surfaces. This reduces friction and allows them to move smoothly.

5.      Differentiate between linear and circular motion.

Linear Motion	Circular Motion
The motion of a body in a straight line is called linear motion.	The motion of a body in a circular path is called circular motion.
Example: A car moving on a straight road.	Example: The hands of a clock.

6.      What is a simple machine, and how does it make work easier?
A simple machine is a device that is simple in structure and makes our work easier and faster.
It reduces the effort needed to do work or changes the direction of force.

7.      List three types of simple machines and give an example of each.

Simple machine	Example
Lever	Crowbar
Pulley	Well pulley
Wheel and axle	Doorknob

8.      Explain how a lever can be used as a simple machine to lift heavy objects.
A lever helps lift heavy objects by reducing the effort needed. It uses a fulcrum (pivot) to multiply the applied force, making lifting easier.

9.      Why simple machines are considered essential tools for various activities?
Simple machines are considered essential tools for various activities because they make work easier, save time and energy, reduce human effort, and help lift or move heavy objects.

10.   List three advantages of simple machines.
The three advantages of simple machines are:
i) They make work easier.
ii) They reduce human effort.
iii) They save time and energy.

11.   not necessary

12.   Write any two differences between:
i) Rest and motion

Rest	Motion
A body does not change its position with respect to a fixed point.	A body changes its position with respect to a fixed point.
Example: A book on a table.	Example: A moving bicycle.

 

 

ii) Linear motion and curvilinear motion

Linear Motion	Curvilinear Motion
The motion of a body in a straight line is called linear motion.	The motion of a body in a curved path is called curvilinear motion.
Example: A car moving on a straight road.	Example: A car moving in a curved road

iii) Simple machine and complex machine

Simple Machine	Complex Machine
A simple machine has few parts and makes work easier.	A complex machine is made up of two or more simple machines working together.
Example: Lever, pulley, etc.	Example: Bicycle, sewing machine, etc.

 

Long questions

1.      Draw a neat diagram of the following simple machines.
a) Scissors                          b) Pulley
c) Screw                             d) Wheel and axle
Also write the main use of each.
चित्र बनाऊ
a) Scissors: Used for cutting paper, cloth, etc.
b) Pulley: Used for lifting heavy loads.
c) Screw: Used for fastening or joining objects.
d) Wheel and axle: Used for moving or lifting heavy objects with less effort.

2.      Which simple machine is used to lift water from a well? How does it help to lift water? Explain with figure.
A pulley is used to lift water from a well. It helps to lift water in the following ways:
i) It changes the direction of force.
ii) It makes lifting the bucket easier.
iii) It reduces the effort needed to pull the bucket up.

3.      Identify and name the given figure and write main use of each.
चित्र बनाऊ
a) Wheelbarrow: Used for carrying heavy loads.
b) Screwdriver: Used for tightening or loosening screws.
c) Axe: Used for cutting wood.
d) Knife: Used for cutting fruits, vegetables, and other materials.

4.      Write any four effects of force and explain any one of them.
The four effects of force are:
i) Force can change the position of a body.
ii) Force can change the speed of a moving body.
iii) Force can change the direction of a moving body.
iv) Force can change the shape and size of a body.

Force can change the shape and size of a body:
Force can change the shape and size of an object by squeezing or stretching it. For example, squeezing a sponge makes it smaller, and stretching a rubber band makes it longer.

5.      Write any four utilities of simple machines in our daily life.
The four utilities of simple machines in our daily life are:
i) They make work easier.
ii) They reduce the effort needed to do work.
iii) They save time and energy.
iv) They help lift and move heavy objects.