Force, Work, Power and Energy

Important Questions

The ideas of force, work, power, and energy are essential building blocks in the field of physics that enable us to comprehend and measure the interactions and changes that occur in the physical world. These ideas are fundamental to understand object behavior, motion mechanics, and the capacity to carry out a range of jobs and activities. Let’s investigate these ideas that form the basis of our comprehension of the physical universe and how they relate to each other to explain the dynamics of motion and the transfer of energy in everyday life as we delve into the realm of ICSE Class 10 Physics. Comprehending the concepts of force, work, power, and energy is crucial not just for achieving scholastic success but also for understanding the laws governing the real-world occurrences we encounter. Here you will find class 10 Force, Work, Power and Energy important questions and answers.

Table of Contents

In this chapter on Force, Work, Power, and Energy in ICSE Class 10 Physics, we will delve into the core concepts that drive our understanding of the physical world. This chapter covers key concepts: force—what it is and how it’s measured; work—the application of force over a distance; power—the rate of doing work or transferring energy; and energy—its forms, transformation, and conservation principles. Understanding these fundamentals helps explain motion and everyday phenomena in the world around us. If you want to prepare well then below are some ICSE class 10 physics force questions and answers.

Force is an external agent capable of changing a body’s state of rest or motion. It has a magnitude and a direction. The direction towards which the force is applied is known as the direction of the force, and the application of force is the point where force is applied. Work is referred to as the process of energy that is transferred to an object’s motion by applying force. It is generally represented as the product of displacement and force. Energy, in physics, the capacity for doing work. It may exist in potential, kinetic, thermal, electrical, chemical, nuclear, or other various forms. If you want to practice more questions and clear your understanding, then oswal.io provides you with Class 10 Force, Work, Power and Energy important questions and answers.

(b) increases twice

(c) decreases four times

(d) decreases twice

**Ans.** (a) increases four times

**Explanation:**

Kinetic energy and momentum mathematical expression is defined is-

\text{K.E } = \dfrac{1}{2} \text{mv}^2 \\[4.5 bp]
\rArr \text{K.E = } \dfrac{1}{2} \text{mv}^2 × \dfrac{m}{m} = \dfrac{(mv)^2}{2m} \\[4.5 bp]
\rArr \text{K.E = } \dfrac{P^2}{2m} \text{(∵ Momentum,P = mv)}\\[4.5 bp]
\rArr P = \sqrt{2m(k. E.)}\\
Now, new kinetic energy. K.E’=16 K.E.

\\\text{New, linear momentum, P = }\sqrt{2m(k.E.)} = \sqrt{2m(16 k.E.)} \\[4.5 bp]
\rArr P = 4 \sqrt{2m(k.E.)}\\[4.5 bp]
\rArr P = 4 P [\because P = \sqrt{2m(k.E.)}]

(b) 50 cm

(c) 0 cm

(d) 100 cm

**Ans.** (a) 25 cm

**Explanation:**

Given, uniform meter rule, so weight (Mg) will act at 25 cm. Mg produces anticlockwise moment about point o

(ii) Is power a scalar or vector quantity?

**Explanation:**

(i) Power is the rate at which work is done or energy is transferred or converted. In physics, it is typically measured in watts (W) and is the amount of energy or work done per unit of time. Mathematically, power (P) is defined as:

P = W / t

Where:

P = Power (in watts, W)

W = Work done or energy transferred (in joules, J)

t = Time (in seconds, s)

(ii) Power is a scalar quantity. This means that it has magnitude but no direction. Unlike vector quantities, which have both magnitude and direction (such as force or velocity), power is only concerned with how much energy is transferred or work is done per unit of time, without specifying a particular direction.

**Explanation:**

The work done by a satellite in a circular orbit around a planet is equal to zero. This is because work is defined as the product of the force applied and the displacement over which the force is applied, and the displacement for an object moving in a circular orbit is always perpendicular to the force acting on it.

In the case of a satellite in a circular orbit, the gravitational force between the satellite and the planet provides the centripetal force required to keep the satellite in its circular path. The centripetal force always acts perpendicular to the direction of motion, which means that the displacement of the satellite is also perpendicular to the force.

Work done (W) is calculated using the formula:

W = F * d * cos(θ)

Where:

W is the work done

F is the force applied

d is the displacement

θ is the angle between the force and the direction of motion.

Since θ is 90 degrees (perpendicular), the cosine of 90 degrees is 0, which means that the work done in a circular orbit is zero. Therefore, the satellite does no work on itself as it revolves in a circular orbit around the planet, and the work done by the satellite is also zero.

**Explanation:**

When a number of forces acting on a body produce no change in its state of rest or of uniform motion, the body is said to be in equilibrium.

The two conditions of equilibrium of a body:

(i) The resultant of all the forces acting on the body should be equal to zero.

(ii) The algebraic sum of moments of all the forces acting on the body about a point should be zero.

Chapter No. | Chapter Name |
---|---|

Chapter 1 | Force Work Power and Energy |

Chapter 2 | Simple Machines |

Chapter 3 | Refraction of Light |

Chapter 4 | Refraction Through Lenses |

Chapter 5 | Spectrum |

Chapter 6 | Vibrations of Sound |

Chapter 7 | Sound |

Chapter 8 | Electricity |

Chapter 9 | Electrical Power and Household Circuits |

Chapter 10 | Magnetic Effect of Current |

Chapter 11 | Specific Heat Capacity and Latent Heat |

Chapter 12 | Radioactivity and Nuclear Energy |

Force is the fundamental topic within the ICSE class 10 physics curriculum.. If you seek additional practice and a deeper comprehension of the topics covered in the chapter, oswal.io offers an extensive array of ICSE class 10 physics force questions and answers to facilitate a more profound understanding of the concepts.

Chapter Wise Important Questions for ICSE Board Class 10 Physics |
---|

Force Work Power and Energy |

Simple Machines |

Refraction of Light |

Refraction Through Lenses |

Spectrum |

Vibrations of Sound |

Sound |

Electricity |

Electrical Power and Household Circuits |

Magnetic Effect of Current |

Specific Heat Capacity and Latent Heat |

Radioactivity and Nuclear Energy |

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