Newton's 1st law of motion ~by A.S.Khan

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~Sam5010

1. By :- Abdus Samad Khan Class – Xth SlideShare ! Sam5010

2. Sir Isaac Newton (1643-1727) an English scientist and mathematician famous for his discovery of the law of gravity also discovered the three laws of motion . He published them in his book Philosophiae Naturalis Principia Mathematica (mathematic principles of natural philosophy) in 1687 . Today these laws are known as Newton’s Laws of Motion and describe the motion of all objects on the scale we experience in our everyday lives. About Newton

3. Newton’s Contributions Calculus Light is composed of rainbow colors Reflecting Telescope Laws of Motion Theory of Gravitation

4. Newton’s First Law (law of inertia) An object at rest tends to stay at rest and an object in motion tends to stay in motion unless acted upon by an unbalanced force.

5. What does this mean? Basically, an object will “keep doing what it was doing” unless acted on by an unbalanced force. If the object was sitting still, it will remain stationary . If it was moving at a constant velocity, it will keep moving . It takes force to change the motion of an object.

6. Balanced Force Equal forces in opposite directions produce no motion

7. Unbalanced Forces Unequal opposing forces produce an unbalanced force causing motion

8. If objects in motion tend to stay in motion, why don’t moving objects keep moving forever? Things don’t keep moving forever because there’s almost always an unbalanced force acting upon them. A book sliding across a table slows down and stops because of the force of friction . If you throw a ball upwards it will eventually slow down and fall because of the force of gravity .

9. Newton’s First Law is also called the Law of Inertia Inertia : the tendency of an object to resist changes in its state of motion The First Law states that all objects have inertia . The more mass an object has, the more inertia it has (and the harder it is to change its motion).

10. Newton’s First Law (law of inertia) INERTIA is a property of an object that describes how ______________________ the motion of the object More _____ means More _____ much it will resist change to mass inertia

11. The 1 st Law Unless acted upon by an unbalanced force, this golf ball would sit on the tee forever.

12. Inertia

13. Terminal Velocity

14. What We have Learnt The first law states that if the  net force  (the  vector sum  of all forces acting on an object) is zero, then the  velocity  of the object is constant. Velocity is a  vector  quantity which expresses both the object's  speed  and the direction of its motion; therefore, the statement that the object's velocity is constant is a statement that both its speed and the direction of its motion are constant. The first law can be stated mathematically as Consequently, An object that is at rest will stay at rest unless an external force acts upon it. An object that is in motion will not change its velocity unless an external force acts upon it.

15. Video – Law of Motion Make Sure Sound Is On!

16. Vocabulary Inertia: the tendency of an object to resist changes in its state of motion Acceleration: •a change in velocity •a measurement of how quickly an object is changing speed, direction or both Velocity: The rate of change of a position along a straight line with respect to time

17. End of Presentation! Thank you for giving your time to watch this Presentation made by me. Hope you like it! Thank You! Presentation Made Completely by :- Name – Abdus Samad Khan(Sam5010) Class – Xth