Samacheer Kalvi 3rd Standard Science Book Solutions Term 1 Chapter 3 Force

I. Fill in the blanks with suitable words:
(Push, force, pull, speed, gravitational force, direction, Muscular)

Question 1.
A __________ is needed to make a stationary object move.
Answer:
Force

Question 2.
The force applied with the help of muscle is called _________ force.
Answer:
muscular

Question 3.
__________ and __________ are known as forces.
Answer:
Push and pull

Question 4.
The reason for the fruits to fall from the tree is ________.
Answer:
gravitational force

Question 5.
Force changes the _________ and ________.
Answer:
speed and direction

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force

II. Match the words with their pictures:

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force 1

Answer:

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force 2

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force

III. Answer the following questions:

Question 1.
How do you open the door?
Answer:
I open the door by pushing or pulling.

Question 2.
Name the types of force.
Answer:
i) There are two types of forces.

  1. Contact force
  2. Non-contact force.

ii) Contact force is classified into three

  1. Muscular force
  2. Mechanical force
  3. Frictional force

iii) Non-Contact force is classified into two.

  1. Gravitational force
  2. Magnetic force.

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force

Question 3.
Which force is involved in collecting water from well?
Answer:
Muscular force is involved in collecting water from well.

Question 4.
What is push?
Answer:
When a force is applied in the direction of an object, it is called push.

Question 5.
What kind of force is used to make clay pot?
Answer:
Muscular force is used to make clay pot.

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force

IV. Sujatha places a magnet near some objects. What are the objects that will be attracted from the list given below?
(note, pin, coin, rubber, shirt, comb, steel tumbler, nail)
Answer:
pin, coin, steel tumbler, nail.

V. Think and answer:
Raja throws a ball, a stone, a paper, and a leaf up in the air? What kind of force is involved here? What will happen to them?
Answer:
i) Gravitational force is involved here.
ii) So the ball, the stone, the paper, and the leaf will fall down. The earth pulls all the objects towards itself.

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force

Intext Activity:

Let us look at the pictures below to understand movement and action better (Text Book Page No. 114):

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force 3

In the above pictures.

Question 1.
What moves? _______, ________
Answer:
The ball, The cycle.

Question 2.
What is the action? _______, ________
Answer:
Hitting the ball, Riding the bicycle.

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force

Put a tick (✓) mark for the pictures of motion (Text Book Page No. 116):

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force 4

Answer:

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force 5

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force

Classify the following – Push or Pull (Text Book Page No. 116):

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force 6

Answer:

S.NoActivitiesPush / Pull
1Riding the bicyclePush
2Moving the table towards youPull
3Dragging the chairPull
4Moving a car to startPush
5Opening the windowPush
6Stretching the rubber bandPull
7Removing the shoe lacesPull

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force

Match the following (Text Book Page No. 118):

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force 7

Answer:

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force 8

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force

Observe the picture and write the kind of force involved here (Text Book Page No. 120):

Question 1.

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force 9

Answer:
Muscular force

Question 2.

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force 10

Answer:
Mechanical force

Question 3.

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force 11

Answer:
Gravitational force

Question 4.

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force 12

Answer:
Magnetic force

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force

Tick (✓) the muscular force (Text Book Page No. 120):

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force 13

Answer:

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force 14

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force

Think (Text Book Page No. 121):

Question 1.
Why do we sprinkle the powder on the carrom board before playing carrom?
Answer:
We sprinkle the powder on the carrom board to make the surface of the board smooth. This reduces the friction between the surface of the carrom board, the striker, and the coins. As a result, the coins and the striker can move easily on the carrom board.

Classify (Text Book Page No. 121):

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force 15

Answer:

List out the push activitiesList out the pull activityList the frictions here
SwingPulling woodSliding
Playing foot ballPulling trolleyPlaying in sand
Kids scooter, cyclingKitingSee saw

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force

3rd Standard Science Guide Force Additional Questions and Answers

I. Choose the correct answer:

Question 1.
________ is the motion which gives the required result.
(a) Action
(b) Direction
(c) Shape
Answer:
(a) Action

Question 2.
________ involves an interaction between two or more objects.
(a) Matter
(b) Force
(c) Action
Answer:
(b) Force

Question 3.
When a force is applied without touching an object, it is called force.
(a) contact
(b) mechanical
(c) non-contact
Answer:
(c) non-contact

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force

II. Fill in the blanks:

Question 1.
Change in position of an object is called _________.
Ahs :
movement

Question 2.
_________ is required in pulling than in pushing.
Answer:
Less force

Question 3.
The force applied by using the parts of our body is called _________ force.
Answer:
muscular

Question 4.
_________ is a force actions between two surfaces in contact.
Answer:
Friction

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force

III. Write True or False:

Question 1.
Force can lift or drop an object.
Answer:
True

Question 2.
The force applied by a machine is called magnetic force.
Answer:
False

Question 3.
The force between two stones created a spark is called frictional force.
Answer:
True

Question 4.
Muscular force is a non-contact force.
Answer:
False

Samacheer Kalvi 3rd Standard Science Guide Term 1 Chapter 3 Force

IV. Answer in a word or two:

Question 1.
Define Motion.
Answer:
When an object or a thing moves from one place to another, it is said to be in motion.

Question 2.
What is force?
Answer:
Force is a push or a pull on an object which makes it move, changes its shape, or stops it from moving.

Question 3.
What is pull?
Answer:
When a force is applied in the direction opposite to the direction of an object, it is called pull.

Samacheer Kalvi 3rd Standard Science Guide