Grade 6 | Science Notes - Force and Motion | Unit-2 | Lesson-2

a. When force is applied to a body, it may set in motion. (✓)

b. Force does not change or tend to change the shape of a body. (✕)

c. The motion of the earth around the sun is random. (✕)

d. When a mango falls from a tree, it has rotatory motion. (✕)

e. The unit of force is newton. (✓)

3. Tick (✓) the correct answer (MCQs).

a. The rate of change of velocity is called:

i. speed

ii. force

iii. acceleration (✓)

iv. motion

b. ...... produces translator motion.

i. friction

ii. gravity

iii. force (✓)

iv. oscillation

c. Flying butterfly shows ...... motion.

i. random (✓)

ii. oscillatory

iii. circular

iv. rotatory

d. A moving bus is in ...... with respect to tree.

i. rest

ii. motion (✓)

iii. random

iv. force

i. translatory

ii. random

iii. circular

iv. oscillatory (✓)

4. Match the following:

Answer:

5. Define:

a. Motion - A body is said to be in motion if it changes it's position with respect to it's surrounding bodies.

#What do you mean by motion?

b. Force - Force is defined as the push or pull that changes or tends to change the position of a body.

#What do you mean by force?

c. Random motion - The motion which is not in a fixed direction is called random motion.

#What do you mean by random motion?

d. One newton force - The force that is applied to a body of mass one kg to produce an acceleration of one m/s2 is said to be one newton force. ∴ 1N = 1kg x 1 m/s2 = 1kg m/s2

#What do you mean by One Newton Force?

6. Identify the type of motion:

a. a boy sliding down on a slope

Answer: Translatory motion (Linear motion).

b. the motion of a rote ping

Answer: Circular motion.

c. spinning top

Answer: Rotatory motion.

d. a swinging pendulum of a clock

Answer: Oscillatory motion.

7. Differentiate between:

a. Circular motion and rotatory motion.

Answer: The difference between circular motion and rotatory motion are:-

b. Speed and Velocity.

Answer: The difference between speed and velocity are:-

8. Answer the following questions.

a. What do you mean by rest?

Answer: A body is said to be at rest if it does not change it's position with respect to it's surrounding.

b. Write any five examples of the bodies which are at rest.

Answer: The five examples of the bodies which are at rest are:-

1. A bus without a driver,

2. A person sitting on a chair,

3. Electric fan without electricity,

4. Car without engine.

5. Water in a bucket.

c. What are the types of motion?

Answer: There are several types of motion. Some of them are as given below:

1. Translatory motion (Linear motion),

2. Circular motion,

3. Rotatory motion,

4. Oscillatory motion,

5. Random motion.

d. What is a circular motion? Give it's three examples.

Answer: The motion of a body in a circular path is called circular motion. The three examples of circular motions are:-

1. The motion of the hand of a wrist watch,

2. The motion of a person in a rote ping,

3. A ceiling fan's blades rotating around a hub.

e. What is random motion? Give an example.

Answer: The motion which is not in a fixed direction is called random motion. Examples of random motion are - a flying honey bee, butterfly, dragonfly, etc.

f. What is speed? Write it's SI unit.

Answer: The distance covered by a body per unit time is called speed. The SI unit of speed is metre per second (m/s).

g. Rest and motion are relative terms. Write in brief.

Answer: The same object may be at rest with with respect to an object but in motion with respect to another object. Let say - in a moving bus, passengers are at rest with respect to each other but the passengers are in motion with respect to the nearby trees, electric poles, etc. So, rest and motion are relative terms.

h. What is force? Write the SI unit of force.

Answer: The push or pull that changes or tends to change the position of a body is force. The SI unit of force is newton (N).

i. Enlist the effects of force.

Answer: The effects of force are enlisted below:

1. Effect on shape.

2. Effect on motion.

3. Effect on direction.

4. Effect on the volume of a body.

j. What is translatory motion (linear motion)? Give any two examples of it.

Answer: The motion of a body along a straight line is called translatory motion (linear motion). The two examples of translatory motion (linear motion) are - a boy sliding down on a straight slope and an apple falling down from a tree.

9. Diagrammatic questions:

a. Observe the given figures and write down the types of motion which they show.

b. Draw a neat and labelled diagram of an object to show a circular motion.

10. Numerical problems:

a. A car covers a distance of 200 m in 20 seconds. What is it's speed?

Solution:

Distance travelled by a car = 200 m.

Time taken = 20 seconds (s).

Speed = ?

We know that,

Speed = Distance travelled/Time taken = 200 m/20 s = 10 m/s.

∴ Speed = 10 m/s.

b. A boy runs on a straight road. If he covers 160 meters in 1 minute, what is his velocity?

Solution:

Distance travelled on a straight road = 160 meters (m).

Time taken = 1 minute = 1 x 60 seconds (s) = 60 s.

Velocity = ?

We know that,

Velocity = Distance Travelled on a straight road/Time taken = 160 m/60 s = 2.67 m/s.

∴ Velocity = 2.67 m/s.

GLOSSARY:

Gravity - the force of the planets that attracts objects towards their centre. (#gravity meaning in nepali language is गुरुत्वाकर्षण, गुरुत्व)

Spin - to turn round and round quickly. (#spin meaning in nepali language is घुम्नु, कात्नु)

Hurl - to throw something in a particular direction. (#hurl meaning in nepali language is फ्याँकिएको, फ्याँक्नु, हिर्काउने, तुफान)

Pendulum - a long straight part with a weight at the end that swings freely. (#pendulum meaning in nepali language is पेंडुलम)

#From above grade class-6 science notes of "Force and Motion" Unit-2, Lesson-2, we hope students will be able to:

• Define force with it's unit.
• Describe the effects of force.
• Demonstrate the state of rest and motion of a body by applying force.
• Identify the types of motion and explain them briefly.

#Thanks for visiting us. We are really happy providing the notes of Grade/Class-6 Science Notes of Force and Motion, Unit-2, Lesson-2 :) Please leave comments or suggestions so that we can improve.😊

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