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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