# Force and its Effects Class-6th Goyal Brothers Physics Solutions

Force and its Effects Class-6th Goyal Brothers Physics Solutions Chapter-3, Unit 1. We Provide Step by Step Answers of Objective, True False , Fill in the blanks, Match the following , Study Questions of Chapter- 3 , Force, Unit-1 (Force and its Effects). Visit official Website for detail information about ICSE Board Class-6.

## Force and its Effects Class-6th Goyal Brothers

Physics Solutions Chapter-3 (Unit 1)

 Board ICSE Class 6th Subject Physics Book Name Goyal Brothers Theme-3 Force Unit-1 Force and its Effects Topic Solution of exercise questions Session 2023-24

### OBJECTIVE TYPE QUESTIONS

Physics Solutions Chapter-3, unit-1

#### A. Fill in the blanks :

1. On the application of force on a wooden block, it moves closer to us. The force so applied is the force of _consequential_.
2. When a spring is stretched, the force changes the _shape_ of the spring.
3. The force which stops a rolling ball on the ground is a _pull_ force.
4. The force possessed by fast moving wind is used to drive a _sail boat_.
5. The force of _gravitation_ always attracts a body.

#### B. Write ‘True’ or ‘False’ for the following statements :

1. A force of push always makes a body to move. [F]
2. The force produced by the muscles of living beings is called muscular force. [T]
3. The force produced in compressing a spring is consequential force. [T]
4. A boy holding a cricket bat in his hands is exerting no force. [F]
5. A force of push can act through a rigid connector only. [T]

#### C. Statement given below are incorrect. write the correct  statement:

1. Force of push can act through non-rigid connector.

Correct Statement: Force of push can act through rigid connector.

2. The force which acts on a body directly or through a connector is called consequential force

Correct Statement: The force which acts on a body directly or through a connector is called contact force

3. The magnetic force is an example of a contact force.

Correct Statement: The gravitational force is an example of a contact force.

4. The force of friction is an example of non-contact force.

Correct Statement: The force of friction is an example of contact force.

5. The magnetic force always causes attraction.

Correct Statement: The gravitational force always causes attraction.

#### 1. The electrical force is a :

(a) Contact force

(b) non-Contact force

(c) consequential force

(d) none of these

Ans: (b) non-Contact force

#### 2. The force of gravitation causes :

(a) Only attraction

(b) only repulsion

(c) both (a) and (b)

(d) none of these

Ans: (a) Only attraction

#### 3.  A speeding car stops slowly when its engine fails due to the force of :

(a) gravitation

(b) friction

(c) both (a) and (b)

(d) none of these

Ans: (c) both (a) and (b)

#### 4. When a spring is stretched the consequential force which appears in its coil is :

(a) force of friction

(b) force of tension

(c) force of gravity

(d) both (a) and (b)

Ans: (b) force of tension

#### force

Column A Column B

### STUDY QUESTIONS

#### (a) What do you understand by the term Force?

Answer: Force is a push or pull on an object that produces acceleration in the body on which it acts. S.I. unit of force is Newton.

#### (b) Name the kind of force which acts in each, which a force can produce in a (i) Stationary body (ii)Moving body.

Answer: The force when applied to a body can change its state from rest to motion or from motion to rest. So, when a force is applied to a stationary body, The body starts moving. If the body is not free to move, it deforms due to the force applied. Here the contact force is seen

In case of a moving body, a force can

• stop the moving object or slow them down.
• can make a moving object move faster
• can change direction of moving objects

Here muscular force acts in a moving body.

#### Question 2. Name the kind of force which acts in each of the following cases :

(a) A football rolling down on a football ground: Consequential force

(b) A stone thrown vertically upward: Gravitational force

(c) A mule carrying a heavy load: Muscular force

(d) Cutting of vegetables: Muscular force

(e) A plastic ruler rubbed with woollen cloth and then brought near dry bits of straw: Electrical force

(f) A fast moving wind driving a windmill: Mechanical Force

(g) Falling of snow from the sky: Gravitational force

(h) Attraction of common pins towards magnet:  Magnetic Force

#### Question 3. By supporting your answer with examples, explain, what do you understand by the following :

(a) contact forces: Contact force is defined as a type of force in which two or more bodies come in contact to experience the force. Pushing a table is an example of a contact force.

(b) forces at distance: These forces are those types of forces that result even when the two interacting objects are not in physical contact with each other, yet are able to exert a push or pull despite their physical separation.

(c) consequential forces: The consequential force can be defined as a force which is called into play, when a force is applied on an object. Examples: ( a) When a cricket ball is made to roll on the ground by applying force, it stops after covering a certain distance, although, no force is applied to stop it.

#### Question 4. Briefly describe how can you prove that weight of body is a kind of force.

Answer: Force is defined as F=ma , where m = mass of a body & a= acceleration of a body. And we also know that weight=mass*g, where g is gravitational acceleration. And this definition also fits in the definition of force therefore it is safe to say that weight is a kind of force only.

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