Samacheer Kalvi Class 3 Science Term 1 Chapter 3 Force Question Answer
Samacheer Kalvi Class 3 Science Term 1 Chapter 3 Force Question Answer Solution in this page. Students of Tamilnadu Board will get here Force Chapter’s Exercise Question Answer Solution with Additional Questions and Answer.
I.) Fill in the blanks with suitable words.
(Push, force, pull, speed, gravitational force, direction, Muscular)
1.) A –force——-is needed to make a stationary object move.
2.) The force applied with the help of muscle is called —-muscular————- force.
3.) —–Push————— and ——pull————– are known as forces.
4.) The reason for the fruits to fall from the tree is ———gravitational force————.
5.) Force changes the —-speed—————- and —-direction—————-.
III.) Answer the following questions.
1.) How do you open the door?
Ans- I open the door by pulling or pushing.
2.) Name the types of force.
Ans- Force is two types.
Contact force and Non-contact force
3.) Which force is involved in collecting water from well?
Ans- Muscular force
4.) What is push?
Ans- When a force is applied in the direction of an object is called push.
5.) What kind of force is used to make clay pot?
Ans- Muscular 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)
Ans- Pin, comb, steel tumbler
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?
Ans- Gravitational force is involved here.
They will come down. The force applied by the Earth to pull objects towards itself.
Additional Questions–
1) Write the answers in one or two sentences.
1) Movement – Change in position of an object is called movement.
2) Action – action is the motion which gives the required result.
3) Motion- When an object or a thing moves from one place to another, it is said to be in motion.
4) Push- When a force is applied in the direction of an object, is called push.
5) Pull- When a force is applied in the direction opposite to the direction of an object, it is called pull.
6) Muscular force – The force applied by using the parts of our body is called muscular force.
7) Mechanical force- The force applies by a machine is called mechanical force.
8) Gravitational force – The force apply by the earth to pull objects towards itself is called gravitational force.
9) Magnetic force- A magnet is a material that attracts things made of iron. The force that attracts things is called magnetic force.
10) Friction – Friction is a force of actions between two surfaces in contact or when they slide over one another.
2) Answer the following questions briefly.
1) Define Force
2) Write the effect of Forces.
3) Define Contact Force and Non-contact Force.
4) Define Frictional force.
Answer
1) Force
Force is a push or a pull on an object which make it move, changes its shape or stops it from
moving. Force involves and interaction between two or more objects.
Force can lift or drop any object.
Without force we can not move any object.
2) Effect of forces is,
a) Energy is needed to apply force. Force helps us to do the following things,
b) Force can change the direction
c) Force can change the speed
d) Force can stop a moving object
e) Force can change the shape
f) Force is classified into two.
3) Contact force and non contact force
Contact Force
When a force is applied by touching the object, it is called contact force.
Ex- lighting a matchstick
Contact force is classified into three.
a) Muscular force
b) Mechanical force
c) Frictional force
Non contact force
When a force is applied without touching and objects it is called non contact force.
Ex- Vacuum cleaner, Magnet
Non contact force is classified into two.
a) Gravitational force
b) Magnetic force
4) Frictional force – When we roll down a ball on grass ground, it slows down and finally stops. We know that an object cannot stop without force. The force that stopped the ball is frictional force. Force exerted by the surface and object moves over it is called frictional force. Friction is a force of actions between two surfaces in contact or when they slide over one another.