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Class VI T1 Science Force and Motion Textbook Solutions
Unit 2 Force and Motion
Evaluation
I. Choose the correct answer.
1. Unit of speed is
a. m b. s c. kg d. m/s
Ans: d. m/s
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.
Ans: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)
Ans: b. Speed = Distance / Time
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.
Ans: a. Statement 1 alone is correct.
II. Fill in the blanks.
1. A bike moving on a straight road is an example for ___________ motion.
Ans: linear
2. Gravitational force is a ___________ force.
Ans: non-contact
3. Motion of a potter’s wheel is an example for ___________ motion.
Ans: rotatory
4. When an object covers equal distances in equal interval of time, it is said to be in ___________motion.
Ans: uniform
III. State True or False. If false, correct the statement.
1. To and fro motion is called oscillatory motion.
Ans: True
2. Vibratory motion and rotatory motion are periodic motions.
Ans: True
3. Vehicles moving with varying speeds are said to be in uniform motion.
Ans: False
Vehicles moving with varying speeds are said to be in non-uniform motion.
4. Robots will replace human in future.
Ans:True
IV. Match the following.
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.
VI. Complete the analogy.
1. Kicking a ball : Contact force :: Falling of leaf : ?
Ans: Non-contact force
2. Distance : metre :: Speed : ?
Ans: m/s
3. Circulatory motion : A spinning top :: Oscillatory motion : ?
Ans: Swing of a pendulam
VII. Complete the web chart.
VIII. Answer in a word or two.
1. The force which acts on an object without physical contact ___________.
Ans: Non-contact force
2. A change in the position of an object with time ___________.
Ans: Motion
3. The motion which repeats itself after a fixed interval of time ___________.
Ans: Periodic motion
4. The motion of an object which covers equal distances in equal intervals of time ___________.
Ans:Uniform motion
5. A machine capable of carrying out a complex series of actions automatically ___________.
Ans: Robot
IX. Answer briefly.
1. Define force.
Forces are push or pull by an animate or inanimate agency.
2. Name different types of motion based on the path.
Linear motion
Curvilinear motion
Circular motion
Rotatory motion
Oscillatory motion
Zigzag motion
3. If you are sitting in a moving car, will you be at rest or motion with respect your friend sitting next to you?
With respect to the friend sitting next to me, I am at rest.
4. Rotation of the earth is a periodic motion. Justify.
The earth rotates on its own axis in equal intervals of time, so it is a periodic motion.
5. Differentiate between rotational and curvilinear motion.
X. Answer in detail.
1. What is motion? Classify different types of motion with examples.
The change of position of an object with respect to time is known as motion.
XI. Problems.
1. A vehicle covers a distance of 400km in 5 hour. Calculate its speed.
Speed = Distance travelled/ Time taken
Distance travelled = 400 km
Time taken = 5 hour
Speed = 400 km / 5 hour
= 80 km/hr
XII. Give examples
Linear Motion - A coconut falling from tree
Curvilinear Motion - Motion of a paper flight
Self rotatory motion - Motion of the wheel in cart
Circular Motion - Revolution of moon around the earth
Oscillatory motion - Wagging tail of a dog
Irregular Motion - Striking of carrom board coin