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SS2: PHYSICS - 1ST TERM

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  1. Scalars & Vectors | Week 1
    5 Topics
    |
    1 Quiz
  2. Equations of Motion | Week 2
    3 Topics
    |
    1 Quiz
  3. Projectile | Week 3
    5 Topics
    |
    1 Quiz
  4. Equilibrium of Forces I | Week 4
    4 Topics
  5. Equilibrium of Forces II | Week 5
    4 Topics
    |
    1 Quiz
  6. Stability of a Body | Week 6
    4 Topics
    |
    1 Quiz
  7. Simple Harmonic Motion (SHM) | Week 7
    4 Topics
  8. Speed, Velocity & Acceleration & Energy of Simple Harmonic Motion | Week 8
    5 Topics
    |
    1 Quiz
  9. Linear Momentum | Week 9
    6 Topics
    |
    1 Quiz



Lesson 9, Topic 2
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Newton’s Laws of Motion

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Topic Content:

  • Newton’s First Law of Motion
  • Newton’s Second Law of Motion
  • Third Law of Newton

Sir Isaac Newton studied the behaviour of bodies in motion and was able to come up with three laws governing motion and they are as follows:

Newton’s First Law of Motion:

A body will continue to be in a state of rest or of uniform motion unless it is acted upon by an external force.

Newton’s Second Law of Motion:

The time rate of change of momentum of a body is directly proportional to the applied force and this takes place in the direction of the force.

Therefore, \( \scriptsize F \propto \normalsize \frac{change \: in \: momentum}{time} \)

\( \scriptsize F \propto \normalsize \frac{mv \: – \: mu}{t} \)

\( \scriptsize F \propto \normalsize \frac{m(v \: – \: u)}{t} \)

Recall that a = \(\frac{final \: velocity\: – \: initial \: velocity}{time} \)

 

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