Summary

• Description:

  The PDF document comprises Form 3 Physics notes on the topic of Newton's Laws of Motion.

  The topics and sub-topics covered in the document include:

  • Newton's First Law of Motion (Law of Inertia)
    • This law states that a body will continue in its state of rest or uniform motion unless an unbalanced force acts on it.
    • Inertia is defined as the property of an object that resists any efforts to change its state of motion.
    • The mass of a body is a measure of its inertia.
  • Newton's Second Law of Motion (Law of Momentum)
    • Momentum is defined as the product of a body's mass and its velocity, with the SI unit being kgm/s or Ns.
    • The law states that the rate of change of momentum of a body is proportional to the applied force and occurs in the direction of the force.
    • This law gives rise to the equation F=ma and introduces impulse (the product of force and time), which is equal to the change in momentum.
    • The notes also explain how to calculate the apparent weight of a body in a lift that is accelerating upwards or downwards.
    • Worked examples are provided for calculating momentum, force, acceleration, and impulse in various scenarios.
  • Newton's Third Law of Motion (Law of Interaction)
    • This law states that "For every action or force there is an equal and opposite force or reaction".
    • An example is provided of a girl on roller skates pushing against a wall to accelerate away from it.
  • Collisions and Conservation of Momentum
    • Linear collisions occur when two bodies collide head-on and move along the same straight line.
    • Collisions are categorized as inelastic, where bodies stick together and only momentum is conserved, and elastic, where bodies bounce off each other and both momentum and kinetic energy are conserved.
    • The law of conservation of linear momentum states that the total momentum of a system of moving objects remains constant if no external forces act on it.
    • Applications of this law include rocket propulsion and the operation of garden sprinklers.
    • Worked examples show how to calculate recoil velocity, common velocity after a collision, and changes in kinetic energy.
  • Friction
    • Friction is defined as a force that opposes the relative motion of two surfaces in contact.
    • The notes outline the laws of friction, noting that sliding (kinetic) friction is less than static friction, and that friction is independent of the area of contact and speed.
    • It also introduces the coefficient of friction and provides worked examples.
    • Viscosity is briefly mentioned as the internal friction of a fluid.

  These notes are comprehensive, neat, and printable, making them an excellent resource for students studying Newton's laws of motion. They are also highly suitable for teachers to use for lesson preparation, providing clear definitions, numerous worked examples, and practical applications to enhance understanding.

• Category:

  Lesson Notes
• Level:

  Form 3
• Subject:

  PHYSICS

Enter your details below to initiate a payment using MPESA.