ICSE Class 10 Physics Selina Solutions Chapter 1: Force Exercise 1(C)

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Introduction

Searching for ICSE Class 10 Physics Selina Solutions Chapter 1 Force Ex 1C? You’re in the right place! Our Selina Concise Physics Class 10 Force Exercise 1C Solutions offer step-by-step answers to help you master uniform circular motion and centripetal force, key topics in Selina Physics Class 10 Chapter 1 Force. Designed for ICSE students, these solutions simplify complex concepts for quick revision and exam success. Download our free PDF to get started!

What is Covered in Selina Physics Class 10 Chapter 1 Force Exercise 1(C)?

Exercise 1(C) focuses on uniform circular motion and centripetal force, essential concepts in physics that explain how objects move in circular paths. Key topics include:

Uniform Circular Motion: Motion of an object in a circle at a constant speed.

Centripetal Force: The force that keeps an object moving in a circular path, directed toward the center.

Examples: Real-world applications like a stone tied to a string or a car on a curved road.

Numerical Problems: Calculations involving centripetal force and velocity.

Our ICSE Class 10 Force Selina Solutions Ex 1C break down these topics with clear explanations and exam-oriented answers.

Study materials related to chapter 1 Force

☛ ICSE Class 10 Concise Physics Chapter 1 Force Ex 1(A) Solutions

☛ ICSE Class 10 Concise Physics Chapter 1 Force Ex 1(B) Solutions

☛ ICSE Class 10 Chapter 1 – Force Notes

☛ ICSE Class 10 Chapter 1 – Force Previous Year Questions

Selina Questions and Solutions from Exercise 1(C)

Below are selina questions from Selina Concise Physics Class 10 Force Exercise 1C with concise solutions to kickstart your preparation:

(A) Multiple Choice Type : Exercise 1(C)

Question 1
Which of the following quantities remains constant in uniform circular motion?
(a) Velocity
(b) Speed
(c) Acceleration
(d) Both velocity and speed
Answer:
(b) Speed
Explanation:
In uniform circular motion, only speed is constant; velocity changes due to the change in direction.

Question 2
The direction of motion in circular motion :
(a) is linear
(b) is along the tangent at that point of the circular path
(c) towards the centre
(d) none of these
Answer:
(b) is along the tangent at that point of the circular path
Explanation:
The instantaneous direction of motion in circular motion is tangential to the path.

Question 3
The direction of centripetal force is always :
(a) along the tangent at that point of the circular path
(b) towards the centre
(c) outwards from the centre
(d) none of the above
Answer:
(b) towards the centre
Explanation:
Centripetal force is always directed towards the centre of the circular path.

Question 4
Centrifugal force is :
(a) a real force
(b) the force of reaction of centripetal force
(c) a fictitious force
(d) directed towards the centre of the circular path
Answer:
(c) a fictitious force
Explanation:
Centrifugal force is an apparent or fictitious force observed in a rotating frame of reference.

Question 5
An artificial satellite is moving in a circular orbit around the Earth. Which statement is correct ?
(a) A force is needed to keep it moving as its speed is changing.
(b) No force is needed as it is in space.
(c) A tangential force of gravity increases its speed.
(d) Centripetal force due to the Earth’s gravity continuously changes the direction of velocity.
Answer:
(d) Centripetal force due to the Earth’s gravity continuously changes the direction of velocity.
Explanation:
The Earth’s gravitational force acts as the centripetal force, continuously changing the direction of the satellite’s velocity while keeping its speed nearly constant in a circular orbit.

Question 6
Clothes in a dryer of a washing machine appear to stick to the drum walls during spinning. What provides the necessary centripetal force to keep the clothes moving in a circle.
(a) gravitational force
(b) friction between clothes
(c) tension in clothes
(d) drum wall
Answer:
(d) Drum wall
Explanation:
The drum wall exerts a normal force on the clothes towards the centre of the circular path. This force acts as the centripetal force required to keep the clothes moving in a circle.

Question 7
Assertion (A) : When a beam is in static equilibrium, the sum of clockwise moments is equal to the sum of anticlockwise moments.
Reason (R): According to the principle of moments for a body in equilibrium, the sum of moments acting in one direction must be equal to the sum of moments in opposite direction.
(a) both A and R are true and R is the correct explanation of A
(b) both A and R are True and R is not the correct explanation of A
(c) assertion is false but reason is true
(d) assertion is true but reason is false
Answer:
(a) both A and R are true and R is the correct explanation of A
Explanation:
This is the principle of moments — in static equilibrium, total clockwise moments = total anticlockwise moments. So, both A and R are true, and R explains A.

Question 8
Assertion (A) : A heavier object placed at a far distance from the pivot point will have the same moment as a lighter object placed close to the pivot point.
Reason (R) : The moment of force is determined by the magnitude of the force along with its distance from the pivot point.
(a) both A and R are true and R is the correct explanation of A
(b) both A and R are True and R is not the correct explanation of A
(c) assertion is false but reason is true
(d) assertion is true but reason is false
Answer:
(c) assertion is false but reason is true
Explanation:
The moment is given by:
Moment = Force × Perpendicular distance

Question 9
Assertion (A) : The centre of gravity of an irregularly shaped object always lies at its geometric centre.
Reason (R) : The centre of gravity depends on the distribution of mass within an object.
(a) both A and R are true and R is the correct explanation of A
(b) both A and R are True and R is not the correct explanation of A
(c) assertion is false but reason is true
(d) assertion is true but reason is false
Answer:
(c) assertion is false but reason is true
Explanation:
The centre of gravity of an irregular object does not always lie at its geometric centre.
However, the reason is true — it depends on mass distribution, not just shape.

(B) Very Short Questions : Exercise 1(C)

Question 1
Is it possible to have an accelerated motion with a constant speed? Name such type of motion.
Answer:
Yes, it is possible to have accelerated motion with a constant speed. This type of motion is called uniform circular motion.

Question 2
Give an example of motion in which speed remains uniform, but the velocity changes.
Answer:
An example of motion where speed remains uniform but velocity changes is uniform circular motion.
Motion of an artificial satellite around the Earth is a example of uniform circular motion.

Question 3
Name and define the force required for circular motion. State its direction.

Answer:

The force required to keep an object moving in a circular path is called centripetal force.

Definition:
A force acting on a body moving in a circular path towards the centre of the circle is called centripetal force.

Direction:
The centripetal force always acts towards the centre of the circular path.

Question 4
Is centrifugal force a real force?
Answer:
No, centrifugal force is not a real force. It is a fictitious force.

Question 5
State whether the following statements are true or false by writing T/F against them.

(a) Earth moves around the Sun with a uniform velocity.

(b) The motion of Moon around Earth in a circular path is an accelerated motion.

(d) In a uniform circular motion, the speed continuously changes because the direction of the motion changes.

(e) A boy experiences a centrifugal force on his hand when he rotates a piece of stone tied at one end of a string, holding the other end in the hand.

Answer:

(a) False

(b) True

(d) False

(e) False

📌 Recommended: ICSE Class 10 Physics Force Notes

(C) Short Questions : Exercise 1(C)

Question 1
Differentiate between uniform linear motion and a uniform circular motion.

Answer:

Uniform Linear Motion	Uniform Circular Motion
The object moves along a straight path.	The object moves along a circular path.
Speed and direction both remains constant.	Speed is constant but direction changes continuously.
The velocity remains constant because both speed and direction are unchanging.	The velocity changes continuously because the direction of motion keeps changing as the object moves along the circle.
There is no acceleration since both speed and direction are constant.	Accelerated motion due to continuous change in velocity and direction.
Example: A car moving at constant speed on a straight road.	Example: Earth moves around the Sun with a uniform velocity.

Question 2
(a) How does a centripetal force differ from a centrifugal force with reference to the direction in which they act?
(b) Is centrifugal force the force of reaction of the centripetal force?
(c) Compare the magnitudes of centripetal and centrifugal force.

Answer:

(a) Centripetal force acts towards the center of the circular path, while centrifugal force acts away from the center.

(b) No, centrifugal force is not the force of reaction of the centripetal force.

(c) The magnitude of the centripetal and the centrifugal force are equal but their direction are opposite to each other.

Question 3
State two differences between the centripetal and centrifugal force.

Answer:

Centripetal force	Centrifugal force
Force acts towards the centre of the circle.	Force acts away from the centre of the circle.
A real force	A fictitious force

(D) Long Questions : Exercise 1(C)

Question 1
Explain the meaning of uniform circular motion. Why is such motion said to be accelerated?

Answer:
When a body moves with a constant speed in a circular path, its motion is said to be in uniform circular motion.
Uniform circular motion is said to be accelerated as the velocity changes with continuous change in direction of motion.

Question 2
Draw a neat labelled diagram for a particle moving in a circular path with a constant speed. In your diagram show the direction of velocity at any instant.

Answer:
The below diagram shows a particle moving in a circular path with a constant speed and its direction of velocity:

Question 3
A uniform circular motion is an accelerated motion. Explain it. State whether the acceleration is uniform or variable? Name the force responsible to cause this acceleration. What is the direction of force at any instant? Draw diagram in support of your answer.

Answer:
Uniform circular motion is accelerated motion because, although the speed remains constant, the direction of the velocity changes continuously, resulting in a centripetal acceleration that acts towards the center of the circle.
Centripetal force is required for this acceleration and its direction is towards the centre of the circular path.

Question 4
A small pebble tied at one end of a string is placed near the periphery of a circular disc, at the center of which the other end of the string is tied to a peg. The disc is rotating about an axis passing through its centre.
(a) What will be your observation when you are standing outside the disc? Explain.
(b) What will be your observation when you are standing at the centre of the disc. Explain.

Answer:

(a) The pebble seems to move in a circular path when we are sitting outside the circular disc.

(b) The pebble seems to be stationary in front of us when we are standing at the centre of the disc.

Question 5
A piece of stone tied at the end of a thread is whirled in a horizontal circle with uniform speed with the help of hand.

Answer the following questions:

(a) Is the velocity of stone uniform or variable?

(b) Is the acceleration of stone uniform or variable?

(d) Which force provides the centripetal force required for circular motion?

(e) Name the force and its direction which acts on the hand.

(f) What happens if the thread suddenly breaks? Give reason for vour answer.

Answer:

(a) Velocity of stone is variable.

(b) Acceleration of stone is variable.

(d) The tension in the thread provides the necessary centripetal force.

(e) Centrifugal force acts on the hand and its direction is away from the centre.

(f) The stone moves off in a straight-line path tangential to the circle at the point where the thread breaks.
Reason: When the thread breaks, the centripetal force disappears. According to Newton’s first law of motion, the stone continues to move in the direction of its instantaneous velocity, which is along the tangent to the circular path.

Download Free ICSE Class 10 Force Exercise 1C Solutions PDF

Get your Selina Physics Class 10 Chapter 1 Force Ex 1C Answers in a free PDF format. Click below to download and boost your exam preparation!

Why Choose Our Selina Concise Physics Class 10 Ex 1C Solutions?

Step-by-Step Answers: Detailed solutions for all questions in Exercise 1(C).
Concept Clarity: Simplified explanations of uniform circular motion and centripetal force.
Exam-Focused: Includes ICSE Class 10 Physics Uniform Circular Motion Questions and Answers with practice questions and MCQs.
Free PDF Download: Access Selina Physics Class 10 Ex 1C Force Free PDF Download anytime.
ICSE Syllabus-Aligned: Covers all topics tested in the board exams.

Tips to Master ICSE Class 10 Physics Chapter 1 Force Ex 1C

Understand Key Concepts: Learn definitions of uniform circular motion and centripetal force.
Practice Numericals: Solve problems like centripetal force calculations to build confidence.Use Examples: Relate concepts to real-life scenarios like vehicles on curves.
Revise with Notes: Refer to our Selina Concise Physics Class 10 Uniform Circular Motion Notes for quick recaps.
Test Yourself: Attempt ICSE Class 10 Physics Chapter 1 Force Ex 1C MCQs to evaluate your preparation.