## Samacheer Kalvi 6th Science Term 1 Unit 2 Book Back Question and Answers:

Samacheer Kalvi 6th Standard Science Book Back 1 Mark and 2 Mark Question & Answers uploaded online and available PDF for free download. Class 6th New Syllabus Science Term 1 book back question & answer solutions guide available below for English Medium. Class sixth Std Science English Medium Term 1 Unit 2 Forces and Motion book back answers given below. Students looking for class 6th Term I Unit 2 Questions and Answers can check below.

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### Samacheer Kalvi 6th Science Book Back Chapter 2 Term 1 Solution Guide PDF:

TN State Board Class 6th Science Subject Term 1 Unit 2 one mark and two mark solutions guide PDF available below.

#### Unit 2: Forces and Motion

I. Choose the correct answer:

1. Unit of speed is
(a) m
(b) s
(c) kg
(d) m/s
Answer: (d) m/s

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

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

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.
Answer: True.

2. Vibratory motion and rotatory motion are periodic motions.
Answer: False.
Vibratory motion and oscillatory motion are periodic motions.

3. Vehicles moving with varying speeds are said to be in uniform motion.
Answer: False.
Vehicles moving with varying speeds are said to be in non-uniform motion.
(OR)
Vehicles moving with uniform speeds are said to be in uniform motion.

4. Robots will replace humans in the future.
Answer: False. Robots will not replace humans in the future.

III. Fill in the blanks:

1. A bike moving on a straight road is an example of _______ motion.
2. Gravitational force is a _______ force.
3. The motion of a potter’s wheel is an example of _______ motion.
4. When an object covers equal distances in equal intervals of time, it is said to be in _______ motion.

Answers:

1. Linear
2. Non-Contact Force
3. rotatory
4. uniform

IV. Match the following:

Answers:

1. c
2. d
3. b
4. a
5. e

V. Analogy:

1. kicking a ball: contact force :: falling of leaf: ________?
Answer: Noncontact force.

2. Distance : metre :: speed : _______ ?
Answer: metre/second.

3. circulatory motion :: a spinning top :: oscillatory motion : _______ ?
Answer: Swinging of a pendulum.

VI. Given below Is the distance traveled by an elephant across a forest with uniform speed. Complete the data of the table given below with the idea of uniform speed.

 Distance(m) 0 4 12 20 Time(s) 0 2 4 8 10

Answer:

 Distance(m) 0 4 8 12 16 20 Time(s) 0 2 4 6 8 10

(i) Distance/Time = 42 × 4 = 1622 = 8
(ii) Distance / Time = 42 × 8 = 322 = 16
(iii) Time/Distance = 12 × 12 = 122 = 6

VII. Complete the web chart.

Answer:

VIII. Give one word for the following statements.

1. The force acts on an object without physical contact with it.
Answer: non-contact forces.

2. A change in the position of an object with time.
Answer: Motion.

3. The motion repeats itself after a fixed interval of time.
Answer: Oscillatory motion.

4. The motion of an object travels equal distances in equal intervals of time.
Answer: Uniform motion.

5. A machine capable of carrying out a complex series of actions automatically.
Answer: Artificial intelligence.

IX. Answer the following in a sentence or two.

1. Define force.
Answer: Force is a push or pulls by an animate or inanimate agency.

2. Name different types of motion based on the path.
Answer:

1. Linear motion;
2. Curvilinear;
3. Circular motion;
4. Rotatory motion;
5. Oscillatory motion
6. Irregular motion.

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 will be at rest with respect to my friend sitting with me in a moving car.

4. The rotation of the earth is a periodic motion. Justify
Answer:
The rotation of the earth is a periodic motion because it takes an equal interval of time for all rotations.

5. Differentiate between rotational and curvilinear motion.
Answer:
Rotational motion:
The movement of a body about its own axis
Ex: Rotating tape

Curvilinear motion:
Movement of a body along a curved path
Ex. Throwing a ball.

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