Tamilnadu Samacheer Kalvi 6th Science Solutions Term 1 Chapter 2 Force and Motion

Tamilnadu Samacheer Kalvi 6th Science Solutions Term 1 Chapter 2 Force and Motion

Samacheer Kalvi 6th Science Force and Motion Text Book Back Questions and Answers

I. Choose the Correct Answer:

Question 1.

Unit of speed is

a. m

b. s

c. kg

d. m/s

Answer:

d. m/s

Question 2.

Oscillatory motion among the following is

(a) Rotation of the earth about its axis

(b) Revolution of the moon about the earth

(c) To and fro movement of a vibrating string

(d) All of these

Answer:

(c) To and fro movement of a vibrating string

Question 3.

The correct relation among the following is

a. speed = distance × time

b. Speed = distance / time,

c. speed = time / distance

d. Speed = 1 / (distance × time)

Answer:

b. Speed = distance / time

Question 4.

Gita rides with her father’s bike to her uncle’s house which is 40 km away from her home. She takes 40 minutes to reach there.

Statement 1 : She travels with a speed of 1 km/minute.

Statement 2 : She travels with a speed of 1 km/hour

(a) Statement 1 alone is correct.

(b) Statement 2 alone is correct.

(c) Both Statement 1 and 2 are correct.

(d) Neither statement 1 nor statement 2 is correct.

Answer: (a) Statement 1 alone is correct

II. Find whether the following statements are true or false. – if false give the correct Answer.

1.To and fro motion is called oscillatory motion.True

2.Vibratory motion and rotatory motion are periodic motions. True

3.Vehicles moving with varying speeds are said to be in uniform motion. False Non-uniform.

4.Robots will replace human in future.

False, Robots can never be conscious.

III. Fill in the blanks:

1.A bike moving on a straight road is an example of  linear motion.

2.Gravitational force is a non-contact force.

3.Motion of a potter’s wheel is an example of Rotatory motion.

4.When an object covers equal distances in equal interval of time, it is said to be in Uniform motion.

IV Match the following

V. Analogy:

Kicking a ball: contact force :: falling of leaf : non contact forces

Distance : metre :: Speed : m/s

circulatory motion : a spinning top oscillatory motion : Pendulum

VI. Given below is the distance – travelled by an elephant across a forest with uniform speed. 

Complete the data of the table given below with the idea of uniform speed.

VII. Complete the web chart.

VIII. Give one word for the following statements.

Question 1.

The force which acts on an object without Physical contact with it.

Answer:

Non-contact force.

Question 2.

A change in the position of an object with time.

Answer:

Motion.

Question 3.

The motion which repeats itself after a fixed interval of time.

Answer:

Oscillatory motion.

Question 4.

The motion of an object travels equal distances in equal intervals of time.

Answer:

Uniform motion.

Question 5.

A machine capable of carrying out a complex series of actions automatically.

Answer:

Robots.

IX. Answer the following in a sentence or two:

Question 1.

Define force.

Answer:

Forces are push or pull by an animate or inanimate agency.

Question 2.

Name different types of motion based on the path.

Answer:

1.Linear motion.

2.Curvilinear motion.

3.Circular motion.

4.Rotatory motion.

5.Oscillatory motion.

6.Zigzag (irregular) motion.

Question 3.

If you are sitting in a moving car will you be at rest or motion with respect to your friend sitting next to you?

Answer:

I am at rest with respect to my friend, sitting inside the car.

Question 4.

The rotation of the earth is a periodic motion. Justify.

Answer:

Motion repeated in equal intervals of time is called periodic motion. The earth rotates on its axis once in 24 hours. The duration of time is fixed as 24 hours. Therefore the rotation of the earth is a periodic motion.

Question 5.

Differentiate between rotational and curvilinear motion

Answer:

Rotational motion:

A body moves along a circular path.

Without changing its position, about its own (fixed) axis.

Eg. Rotation of a spinning top.

Curvilinear motion:

A body moves along a curved path.

Changes its position with motion.

Eg. Throwing paper airplanes or paper darts.

X. Calculate.

Question 1.

A vehicle covers a distance of 400 km in 5 hours calculate its average speed.

Answer:

Average speed = distance/time

= 400/5 = 80 km per hour

Question 1.

What is motion? classify different types of motion with examples.

Answer:

Motion: The change of position of an object with respect to time is known as motion.

1. Based on Path:

Linear motion. – Ex.: Parade of the soldiers.

Curvilinear motion. – Ex.: Paper flight moving.

Circular motion. – Ex.: Swirling stone tied to the rope.

Rotatory motion. – Ex.: Rotating top.

Oscillatory motion. – Ex.: Clock pendulum.

Zigzag (irregular) motion. – Ex.: Motion of a bee.

2. Based on Duration :

Periodic motion. – Ex.: Motion of a bob of simple Pendulum.

Non-periodic motion. – Ex.: Swaying of the branches of a tree.

3. Based on Speed:

Uniform motion. –

Ex.: Hour hand of a clock.

Non – uniform motion. –

 Ex.: Motion of a train, as it leaves a station.

XII. Fill with Examples

Answer:

 – A man walking in

           a straight road

– motion of paper

  Aeroplane

– Motion of wheel in a

  cart

– Motion of moon a round earth.

– Motion of pendulum

 – Motion of honey bee.

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