Samacheer Kalvi 6th Science Solutions Chapter 2 Pdf
Tamilnadu Board Samacheer Kalvi 6th Science Solutions Chapter 2: Tamilnadu State Board Solution Class 6 Science Chapter 2 – Force and Motion.
Samacheer Kalvi 6th Science Solutions Chapter 2: Overview
|
Board |
Samacheer Kalvi |
| Class |
6 |
|
Subject |
Science |
| Chapter |
2 |
|
Chapter Name |
Force and Motion |
Samacheer Kalvi 6th Science Solutions Chapter 2 Pdf
Force and Motion
Chapter 2
I.) Choose the correct answer.
1.) Unit of speed is
a.) M
b.) S
c.) kg
d.) m/s
Answer: m/s
Solution: The unit of speed is m/s. As M, Kg and S are the units of metre, Kilogram and second respectively.
2.) Which among the following is an Oscillatory motion?
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: To and fro movement of a Vibrating string.
Solution: To and fro movement of a Vibrating string is an oscillatory motion. On the other hand the rotation of the earth about Its axis and the revolution of the moon about the earth are examples of Circular motion.
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: Distance / time taken
Solution: The formula for calculating the speed of an object is by dividing the distance travelled by time taken by the object to cover the distance.
4.) Gita travels with her father in a 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 at a speed Of 1 km / minute.
Statement 2 : She travels at a speed Of 1 km/hour.
a.) Statement 1 alone is correct.
b.) Statement 2 alone is correct.
c.) Both statements are correct.
d.) Neither statement 1 nor statement 2 is correct.
Answer: Statement 1 alone is correct.
Solution: Gita travels 40km in 40 minutes. Speed = distance/time taken , so 40km/40min = 1km/minute.
II.) Fill in the blanks.
1.) A bike moving on a straight road is an Example for ____linear________ motion.
2.) Gravitational force is a ___non contact____ force.
3.) Motion of a potter’s wheel is an Example for ____rotatory_______ motion.
4.) When an object covers equal distances In equal interval of time, it is said to be __periodic_____ In motion.
III.) State True or False. If False correct the statement.
1.) To and fro motion is called oscillatory Motion.
Answer : True
2.) Vibratory motion and rotatory motion Are periodic motions.
Answer: True
3.) Vehicles moving with varying speeds Are said to be in uniform motion.
Answer: False, vehicles moving with a constant speed are said to be in uniform motion.
4.) Robots will replace human in future.
Answer: False because robots are machines that helps in minimising human labour and can make work easier.
IV.) Match the following.
Answer:
| 1. | Linear motion |
| 2. | Rotatory motion |
| 3. | Oscillatory motion |
| 4. | Circular motion |
| 5. | Linear and rotatory motion. |
V.) 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.
| Distance (m) | 0 | 4 | 8 | 12 | 16 | 20 |
| Time (s) | 0 | 2 | 4 | 6 | 8 | 10 |
VI.) Complete the analogy
1.) Kicking a ball : Contact force :: Falling Of leaf : ?
Answer: Non contact force
2.) Distance : metre :: Speed : ?
Answer: metre/second
3.) Circulatory motion : A spinning top :: Oscillatory motion : ?
Answer: A pendulum
VII.) Complete the web chart.
VIII.) Answer in a word or two.
1.) The force which acts on an object Without physical contact.
Answer: Non-contact force
2.) A change in the position of an object With time.
Answer: Motion
3.) The motion which repeats itself after a Fixed interval of time.
Answer: Periodic Motion
4.) The motion of an object which covers Equal distances in equal intervals of Time.
Answer: Uniform motion
5.) A machine capable of carrying Out a complex series of actions Automatically.
Answer: Robots
IX Answer briefly.
1.) Define force.
Answer: A force is an applied push or pull upon an object, usually to change its position.
2.) Name different types of motion based On the path.
Answer: The different types of motion based on the path are Linear, Curvilinear, Circular, Rotatory, Oscillatory and Zigzag.
3.) If you are sitting in a moving car, will You be at rest or motion with respect Your friend sitting next to you?
Answer: With respect to the person sitting next to me in the car , I’ll be at rest. But with respect to other things , outside in the surrounding I’ll be in motion.
4.) Rotation of the earth is a periodic Motion. Justify.
Answer: Periodic Motion refers to movements that repeat in uniform interval of time. So, rotation of the earth about Its axis is an example of periodic Motion.
5.) Differentiate between rotational and Curvilinear motion
Answer: Curvilinear motion- movement of an object in a curved path.
Rotational motion – rotating movement of an object about its own axis.
X.) Answer in detail.
1.) What is motion? Classify different Types of motion with examples.
Answer: When an object changes its position from a state of rest over time is called motion. Motion are of three types.
1) Based on path – Linear, Curvilinear, Circular, Rotatory, Oscillatory and Zigzag.
2) Based on duration – periodic and non periodic.
3) Based on speed – uniform motion and non uniform
XI.) Problems.
1.) A vehicle covers a distance of 400km In 5 hour. Calculate its speed.
Answer: Distance travelled = 400km.
Time taken = 5 hours.
Speed = distance/ time taken , 400/5 = 80km/hr
XII.) Give example.
End…
