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What is thermometry?

Thermometry The branch of heat relating to the measurement of the temperature of a body is called thermometry. The thermometer is an instrument used to measure the temperature of a body. The essential requisites of a thermometer are given as under:  1) Construction, 2) Calibration, and 3) Sensitiveness. For the construction of a thermometer, the proper choice of a substance, whose physical property varies uniformly with rising in temperature, is essential. 1) Construction The physical property of a substance plays an important role in the construction of a thermometer. In a mercury thermometer, the principle of expansion of mercury with rising temperature is used. The platinum resistance thermometer is based on the principle of the change in resistance with a change in temperature. The gas thermometer is based on the principle of change in volume or pressure with a change in temperature. 2) Calibration  When a thermometer is constructed, it should be properly calibrated. The standa

Force

Physics

Chapter - 3: Force

👉 All Chapter Contents 👈 


  • 3.1 Inertia of Concept of Force - Newton's First Law
  • 3.2 Nature of Fundamental Forces
  • 3.3 Balanced and Unbalanced Forces
  • 3.4 Momentum
  • 3.5 Collision
  • 3.6 Effect of Force on Motion: Newton's Second Law
  • 3.7 Gravitational Force
  • 3.8 Newton's Third Law
  • 3.9 Frictional Force


Question Bank

3.1 Inertia of Concept of Force - Newton's First Law

  • State Newton's first law.
  • Explain why we never observe that a body in motion keeps its perpetual motion forever?
  • What does inertia mean?
  • What is inertia of rest?
  • What is inertia of motion?
  • Mass is the measurement of inertia? Explain.
  • What is force?
  • What is contact force?
  • What is a non-contact force?
  • Explain that the concept of inertia is found from Newton's first law.
  • Which way does passenger lean when the moving bus suddenly breaks and why?

3.2 Nature of Fundamental Forces

  • What is fundamental force?
  • How many fundamental forces in nature and what are they?
  • What do you mean by gravity?
  • What do you mean by electromagnetic force?
  • What do you mean by weak nuclear force?
  • What do you mean by strong nuclear force?
  • Discuss the comparative intensity of the fundamental forces.

3.3 Balanced and Unbalanced Forces

  • What do you mean by balanced force?
  • What do you mean by unbalanced force?

3.4 Momentum

  • What is momentum?
  • Determine the unit and dimension of momentum.
  • What do you understand by momentum 200 kgm/s?
  • Write the law of conservation of momentum.

3.5 Collision

  • Write the law of conservation of momentum?
  • Prove the law of conservation of momentum.
  • Write the law of conservation of energy?
  • Show that before the collision and after the collision total momentum is equal.
  • Explain the necessity of force and motion in the case of safe journey.

3.6 Effect of Force on Motion: Newton's Second Law

  • Write the second law of Newton.
  • Prove that, F = ma.
  • Write the unit and dimension of force.

3.7 Gravitational Force

  • What is gravitational force?
  • What is the value of the gravitational constant 'G'?

3.8 Newton's Third Law

  • Write Newton's third law.
  • Explain Newton's third law.

3.9 Frictional Force

  • What is friction?
  • What is frictional force?
  • Explain the origin of friction.
  • How many types of friction and what are they?
  • What is static friction?
  • What is sliding friction?
  • What is rolling friction?
  • What is fluid friction?
  • Explain the effect of friction on the motion?
  • Why there is a groove on the surface of the car tire?
  • Explain how friction can be reduced?
  • Explain how friction can be increased?
  • Explain why friction is a necessary evil?


Secondary Physics


Mathematical Problems


  • What is the force to be applied to a mass of 50 kg to produce an acceleration of 4 ms-2? [Ans: 200 N]

  • A boy pushes a box of mass 20 kg with a force of 50 N. What will be the acceleration of the box? [Ans: 2.5 ms-2]

  • A force of 2000 N acts on a body of mass 20 kg for a time of 0.1 s. What is the change of momentum of the body? [Ans: 200 kgms-1]

  • A bullet of mass 10 g was shot from a gun with a velocity of 500 ms-1. If the mass of the gun is 2 kg, find the backward velocity of the gun. [Ans: 2.5 ms-1]

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