RBSE Solutions for Class 6 Science Chapter 12 Force

RBSE Solutions for Class 6 Science Chapter 12 Force are part of RBSE Solutions for Class 6 Science. Here we have given Rajasthan Board RBSE Class 6 Science Chapter 12 Force.

Board	RBSE
Textbook	SIERT, Rajasthan
Class	Class 6
Subject	Science
Chapter	Chapter 12
Chapter Name	Force
Number of Questions Solved	61
Category	RBSE Solutions

Rajasthan Board RBSE Class 6 Science Chapter 12 Force

Intext Questions

Question 1.
What do you do to open and close the door? To take a box, cupboard or any other heavy article from one place to another at your home, school or any other place. What do you do? (Page 103)
Answer:
Either we pull them or push them.

Question 2.
What is force in the language of science ?
Answer:
Force is a factor which changes either position, motion, direction and size of the body.

Question 3.
How many objects must interest for the force to act? (Page 103)
Answer:
Two objects must interact for the force to act.

Question 4.
What effects happened on applying forces on objects? (Page 104)
Answer:
On applying a force the object may be in motion, may be in condition of rest or may be change in shape.

Question 5.
If any object is moving and there is a force acting in the direction of force, then what effect will happen? (Page 104)
Answer:
On applying force in the direction of motion of a moving object, its speed increases.

Question 6.
What will happen if we apply force in the opposite direction of the direction of motion of a moving object? (Page 105)
Answer:
On applying force in the opposite direction of motion of an object its speed decreases.

Question 7.
Do you know what a player do in the game of football, hockey or cricket to change the direction of the ball? (Page 106)
Answer:
Some type of force is applied by the players in these games to change the direction of the ball.

Question 8.
Where does fruit falls from a tree? Where does an object falls after throwing upward? Why all objects falls on the earth? (Page 107)
Answer:
The earth attracts each and every object towards it. So all objects fall toward earth.

Question 9.
What you have to do to lift a heavy box? (Page 108)
Answer:
We have to apply muscular force.

Question 10.
How many activities you can carry out with the help of muscular force? (Page 108)
Answer:
We can push any cart, lift any weight, closer or open the door etc.

Question 11.
A ball rolling on ground gradually slows down and cones to rest Why does this happen? (Page 108)
Answer:
Surface of the ground, apply a force on the ball which stops the ball’s motion.

Question 12.
When you stop paddling your bicycle it automatically stops after some time. Why does this happen? (Page 108)
Answer:
A friction force acts between wheels of cycle and ground which try to stop the bicycle motion.

Question 13.
On what factor friction depends?
Answer:
Friction force depends on the layers in contact.

Question 14.
Why do we fall down when we step on a banana peel? (Page 108)
Answer:
The banana peel reduces the friction between ground and feet so we fall down when we step on a banana peel.

Question 15.
Why it is not easy to walk on ice. (Page 108)
Answer:
The friction force reduces to zero, so it is difficult to walk on ice.

Question 16.
Why we can walk easily on rough surfaces? (Page 108)
Answer:
Between our steps and rough surfaces a sufficient friction force produces, so that we can walk easily on rough surface.

Activities

Activity – 1 (Page 103)
Complete the table 12 – 1 by carrying out the activities given in it.
Table 12.1

S. No.	Event	Object through which force is applied	Object on which force is applied
1.	Opening a  book	one who is opening the book	book
2.	Closing the door of the cupboard	one, who is Closing the door	Door of the cupboard
3.	Combing your hairs	One, who is combing	comb
4.	Opening the drawers of the table	One, who is opening the door	drawer
5.	Closing the book	One who is closing a book	book

In figure
(a) Two girls
(b) A boy pulling pulling each other a horse

Question 1.
From looking at table 12.1 and at the above figure find out how many object must interact for the force to act.
Answer:
Two objects must interact with each other for the force to act. In figure
(a) two girls pulling each other and in figure
(b) a boy pulling a force.

Activity – 2 (Page 104)
Take a ball. Put it on a table and push it slightly.

Question 1.
Is there any change in the position of the ball?
Answer:
Ball starts to rotate and displace from its place. Put a sheet of paper on the table and blow it

Question 2.
Is there any change in its position.
Answer:
The position of paper changes.
Conclusion : We observe the leaves and the branches of a tree move because of the force applied by the air. A kick brings a football in motion.

Activity – 3 (Page 105)
Roll a ball on the floor, Apply a little force on the ball with your hand in the direction of its motion.

Question 1.
What is the effect on the speed of the ball?
Answer:
The speed of the ball increases.
Observe figure shown below.
Conclusion : In figure man is pulling the cart and another person is pushing it from back.

Question 2.
What is the effect on the speed of the cart?
Answer:
The speed of the cart increases.
Conclusion : On applying the force in the direction of motion of moving object, its speed increases.

Activity – 4 (Page 105)
(i) Push a table so that it starts moving. Ask your friend to push it from the opposite side.

Question 1.
W hat is the change in the motion of the table?
Answer:
Among the greatest force, the table will move in that direction.
(ii) You must have observed that the card of a steel hawker suddenly starts catching speed on a slope, to slow down the speed of the cart the hawker has to pull the cart from behind.

Conclusion : It is clear from both these situations that on applying force in the opposite direction of motion of an object its speed decreases.

Question 2.
In which direction an object will move it we apply two forces in the opposite direction simultaneously.
Answer:
If two force are simultaneously applied in the opposite directions then the object will move in the direction of greater force.

Activity – 6 (Page 108)

1. 1. Take a plastic scale.
   2. Rub it on your dry hairs or on a woolen cloth.
   3. Take it near tiny pieces of paper.

Question 1.
What do you observe?
Answer:
Tiny pieces of paper get attracted towards the plastic scale or comb.

Question 2.
What do you again observe?
Answer:
Pieces of paper again attracted towards the plastic scale or comb.
Observation : Tiny pieces of paper get attracted towards the plastic scale or comb.

Question 3.
Why does this happen ?
Answer:
When the plastic scale or comp is rubbed with dry hairs it accumulates electrostatic charge. This electrostatically charged scale or comb exerts an electrostatic force on the tiny pieces of paper and thus attracts them.

Activity – 7 (Page 109)

Take a glass marble. Create an apparatus as shown is figure. Roll it down the apparatus on a smooth surface.

Question 1.
How far does it move before coming to rest?

Answer:
Glass marble rolls a long distance. Now roll down the glass marble on the same apparatus but on a rough surface.

Question 2.
How far does it move this time before coming to rest?
Answer:
Glass marble comes to rest earlier on the rough surface.
Conclusion : It is clear that friction depends on the surface in contact, if the surface is smooth, then the force of friction will be less where as if the surface is rough, then the force of friction will be more.

Activity – 8 (Page 109)

Take a bar magnet, Bring it near some iron nails.

Question 1.
What do you observe?
Answer:
The iron nails get attracted towards the magnet.

Conclusion: The force applied by a magnet on magnetic materials is called as magnetic force.

Exercises

Tick the correct answer from the following

Question 1.
Which force is used by a horse in pulling a chariot?
(a) Magnetic force
(b) Electrostatic force
(c) Friction
(d) Muscular force
Answer:
(d) Muscular force

Question 2.
In winter season, you can hear a cracking sound and see sparks while pulling of woolen clothes because of
(a) Electrostatic force
(b) Magnetic force
(c) Gravitational force
(d) Muscular force
Answer:
(a) Electrostatic force

Question 3.
The S.I. unit of force is
(a) Joule
(b) Kilogram
(c) Newton
(d) Second
Answer:
(c) Newton

Question 4.
Which among the following cannot be changed by applying force?
(a) Direction of motion
(a) Speed
(c) Shape of an object
(d) Mass of an object
Answer:
(d) Mass of an object

Fill in the blanks

1. The force acting between electrostatic charges is called ……………… .
2. A push or pull is known as ………………. .
3. Falling of a fruit from a tree is an example of …………. .
Answer:
1. electrostatic force
2. force
3. gravity Science

Match the following

Column 1	Column 2
1. Gravitational force	(a) The force exerted in the opposite direction of motion by the surface in contact
2. Muscular force	(b) The force exerted by the earth
3. Friction	(c) The force acting between electrostatic charges.
4. Electrostatic force	(d)The force exerted by muscles.

Answer:
1. (b), 2. (d), 3. (a), 4. (c).

Short Answer Questions

Question 1.
Why does an object finally fall down when we throw it up?
Answer:
The earth attracts each and every object towards it with a force called as gravitational force of the earth.

Question 2.
On which thing does friction depend?
Answer:
Friction depends on the surface in contact.

Question 3.
Differentiate between gravitational force and magnetic force.
Answer:
Gravitational force is applicable on all object and it attracts towards earth, while magnetic force is applicable only on magnetic objects.

Question 4.
Write the S.I. unit of force.
Answer:
Newton.

Question 5.
A 5 newton and 3 newton force is applied on an object in the opposite direction simultaneously. In which direction will the object move?
Answer:
The object will move in the direction of 5 N force.

Long Answer Type Questions

Question 1.
Explain the effects of force with the help of examples.
Answer:

1. It may change the position of an object.
   Example : To hit a ball.
2. It may stop the object in motion
   Example : To break the car.
3. It may change the direction of moving objects.
   Example : Cricket bat changes the direction of incoming ball.
4. It may increase in the motion of moving object.
   Example : In the game of football the speed of football will become more it is kick in the direction of motion.

Question 2.
Friction opposes the motion of an object. Explain this with the help of an activity.
Answer:
Activity:
Take a glass marble. Roll it down on a smooth surface.
1. It move a certain distance we mark at that place.
2. Now we spread sand on surface and repeat this activity and mark again.
Observation : Glass marble stops earlier on sand surface.
Conclusion : Sand impose a friction force in the opposite direction of glass marble. Which comes to rest earlier on the sand.

Question 3.
Explain through an experiment that the shape of an object can be changed on applying force.
Answer:
Experiment :
1. Take a balloon and blow the balloon.
2. Now note down the size of the balloon.
3. Now press the balloon from mid and again note down the size of the balloon.

Observation : The shape of the balloon have changed. Conclusion : On applying force, the shape of an object changes.
Creative work : Prepare a toy car according to the figure show below by using a match box, broomsticks and rubber caps, now perform the activities given in the table
below and conclude that by applying force, the speed of an object can be increased and decreased.

S No.	Activity	Observation
1.	To apply force in forward direction by pulling the string of stationary toy car on a plane surface.	The toy car Changes its state from rest to motion
2.	To apply force on the moving toy car in the direction of its motion	The speed of the toy car increases
3.	To apply force on the moving toy in the opposite direction of its direction of motion	The speed of the toy car decreases.

Other Important Questions

Multiple Choice Questions

Question 1.
How many object must interact for the force to act
Answer:
Two objects must interact with each other for the force to act.

Question 2.
A force may work
(a) in change of shape
(b) in change of motion
(c) in change of position
(d) all of these
Answer:
(d) all of these

Question 3.
On which name the unit of force came
(a) Issac Newton
(b) Ronald Ross
(c) Robert Hooke
(d) Robert Brown
Answer:
(a) Issac Newton

Question 4.
Force imposed by the earth on any object is
(a) magnetic force
(b) frictional force
(c) gravitational force
(d) electrostatic force
Answer:
(c) gravitational force

Question 5.
Force produced due to charge is
(a) gravitational
(b) charging force
(c) friction force
(d) electrostatic force
Answer:
(d) electrostatic force

Fill in the Blanks

1. Two objects must ………… with each other for the force to act.
2. Applying force has different effects on ………….. objects in different ways.
3. On applying force in the direction of motion of a moving object, its speed ……………..
4. The force by which the earth attracts all the objects towards it is known as the ……………. of the earth.
Answer:
1. interact
2. different
3. increases
4. gravitational force.

Very Short Answer Questions

Question 1.
Write any one action of force.
Answer:
To pull a cart by applying a force.

Question 2.
In general language what is the definition of force ?
Answer:
A push or pull is known as force.

Question 3.
A ball is rolling in a field, what is the surface of friction force.
Answer:
Surface of ball and earth.

Question 4.
What is muscular force?
Answer:
Force applied by the muscles is called muscular force.

Question 5.
When wind blow then why leaves and trees are swaying in the wind?
Answer:
Because wind exert force on trees and leaves.

Question 6.
Give an example of muscular force.
Answer:
Pulling the cart by horse.

Short Answer Type Questions

Question 1.
Write some activities in which force is acting.
Answer:

1. Ball is hitting by batsman.
2. Horse is pulling a cart.
3. Car is running.
4. Blowing the balloon.

Question 2.
What can force doe?
Answer:
Force may

1. Change the state of an object.
2. Change the speed of an object.
3. Change the direction of motion of an object.
4. Change the shape of an object.

Question 3.
Why there are treads and grooves on the Tyre?
Answer:
Tyre treed’s and grooves made up on the contact surface of the Tyre. They serve the purpose of increasing contact surface area with the road. Thus friction force produce and vehicles do not slip.

Long Answer Type Questions

Question 1.
What is SI unit of force? Write a brief note on
Newton.
Answer:
The S.I unit of force is Newton (N).
The great scientist Sir Issac Newton studied force, He gave the laws for gravitational force and motion. The unit of force is named after him in his honor, Newton was also a great mathematician. Born in a poor farming family of England. Newton is generally regarded as the most original and influential theorist in the history of science.

Question 2.
Define the following
1. Gravitational force
2. Electrostatic force
3. Friction Force
4. Magnetic force.
Answer:

1. Gravitational force : The force by which the earth attracts all the object towards it is known in as the gravitational force of the earth.
2. 2. Electrostatic force : The force acting between electrostatic charges is known as electrostatic force.
3. Friction force : When an object moves on a surface then a force is applied to it by the surface in the opposite direction of the motion of the object. This force is known as the frictional force or just friction.
4. Magnetic force : The force applied by a magnet on magnetic materials is called as magnetic force.

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