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How mirror can be identified by observing the values of the magnification?

How mirror can be identified by observing the values of the magnification? If an object is placed within the focal length of a mirror, the image of the object will get magnified in case of a concave mirror, and will get diminished in case of a convex mirror. The value of magnification will be greater than 1 in case of a concave mirror, and less than 1 in case of a convex mirror.

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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