Sir Isaac Newton’s

Three Laws of Motion

"Nature and Nature's

Laws lay hid in night;God said,

'Let Newton be!' -- And

all was light." (Pope.)

Sir Isaac Newton1642 - 1727

Three Laws of Motion

1. Law of Inertia

2. Law of Acceleratio

n

3. Law of Interaction

I. The 1st Law of Motion

Law of InertiaAn object at rest will remain at rest, and an object in motion will remain in motion with constant velocity unless acted upon by an external force.

In other words….

a) Balanced and Unbalanced

Forces

http://rds.yahoo.com/_ylt=A0Je5xYySkRFVOYAetiJzbkF;_ylu=X3oDMTBkcjlhYnNrBHBvcwM2MQRzZWMDc3I-/SIG=1h2q9g7eo/EXP=1162189746/**http%3A//images.search.yahoo.com/search/images/view%3Fback=http%253A%252F%252Fimages.search.yahoo.com%252Fsearch%252Fimages%253F_adv_prop%253Dimages%2526imgsz%253Dwallpaper%2526va%253Ddownload%252Bpowerpoint%2526ei%253DUTF-8%2526fr%253Dyfp-t-501%2526b%253D61%26w=800%26h=600%26imgurl=www.cyber.net.pk%252Fschools%252FWall8.jpg%26rurl=http%253A%252F%252Fwww.cyber.net.pk%252Fschools%252Fhtml%252Fdownload.html%26size=32.1kB%26name=Wall8.jpg%26p=download%2Bpowerpoint%26type=jpeg%26no=61%26tt=286%26oid=45e6b3e4748fff8c%26ei=UTF-8

http://rds.yahoo.com/_ylt=A0Je5xYySkRFVOYAetiJzbkF;_ylu=X3oDMTBkcjlhYnNrBHBvcwM2MQRzZWMDc3I-/SIG=1h2q9g7eo/EXP=1162189746/**http%3A//images.search.yahoo.com/search/images/view%3Fback=http%253A%252F%252Fimages.search.yahoo.com%252Fsearch%252Fimages%253F_adv_prop%253Dimages%2526imgsz%253Dwallpaper%2526va%253Ddownload%252Bpowerpoint%2526ei%253DUTF-8%2526fr%253Dyfp-t-501%2526b%253D61%26w=800%26h=600%26imgurl=www.cyber.net.pk%252Fschools%252FWall8.jpg%26rurl=http%253A%252F%252Fwww.cyber.net.pk%252Fschools%252Fhtml%252Fdownload.html%26size=32.1kB%26name=Wall8.jpg%26p=download%2Bpowerpoint%26type=jpeg%26no=61%26tt=286%26oid=45e6b3e4748fff8c%26ei=UTF-8

Click here for better understanding on Balanced

and Unbalanced Forces.

The seat belt provides the unbalanced force which brings you from a state of motion to a state of rest. Perhaps you could speculate

what would occur when no seat belt is used.

Click here for better understanding on Newton’s First Law.

If the truck were to abruptly stop and the straps were no longer functioning, then the ladder in motion would continue in motion.

More on Newton’s First Law

II. The 2nd Law of Motion

The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

Law of Acceleration

Fnet = m . a

It accelerates in the direction that you push it.

If you push twice as hard, it accelerates twice as much.

If it gets twice the mass, it accelerates half as much.

Fnet = m . a

Click here for better understanding on Newton’s Second

Law.

Click on pictures for more problems on Newton’s Second

Law

III. The 3rd Law of Motion

Law of Interaction

In every action, there is always an equal and opposite reaction

Click here for better understanding on Newton’s Third Law.

The elephant's feet push backward on the ground; the ground pushes forward on its feet. The right end of the right rope pulls leftward on the elephant's body; its body pulls rightward on the right end of the right rope. The left end of the right rope pulls rightward on the man; the man pulls leftward on the left end of the right rope. The right end of the left rope pulls leftward on the man; the man pulls rightward on the right end of the left rope. The tractor pulls leftward on the right end of the left rope; the left end of the left rope pulls rightward on the tractor. etc., etc.

Click for more understanding.

up, up and

AWAY!

Let's study how a rocket works to understand Newton's Third

Law.

Summary

Thank You Very Much!!!Prepared By

Kathleen Joy N. Buot