lecture_tan9 - Key Concepts: Lecture 9 Describing Motion...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Key Concepts: Lecture 9 Newton Newton’s Laws of Motion More on Kepler’s Laws Newton’s Law of Universal Gravitation Newton 1642-1727 Only child, posthumous son of an illiterate yeoman – born prematurely - sickly as child – raised by maternal grandmother – practical joker Trinity College, Cambridge University at 18 – encouraged to study physics by Barrow University closed in 1665 due to plague – Invented calculus, studied gravity, optics Cambridge Describing Motion • Position • Velocity • Acceleration – Rate of change of velocity 2 examples of acceleration: Newton’s Laws of Motion Law I: Law of Inertia – A body at rest or in motion at a constant velocity along a straight line remains in that state of rest or motion unless acted on by a net outside force. Takes next logical step beyond Galileo’s definition of inertia ( tendency of a body to keep moving after all forces stop acting on it ) Uniform motion is just as natural a state for a body as being at rest
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Laws of Motion Law II - The Force Law – The acceleration (a) due to an applied force (F) is in the same direction as the to the object’s mass (m) The units of force are chosen so the constant is 1. So we write a = F/m To have acceleration there must be a force same direction Given the same force, a more massive object accelerates more slowly than a less massive one Force=Mass xAcceleration a ! F / m a = constant x F /m constant = 1 a = F/m We can write this as F = m a Examples of the Second Law • Friction – Hockey puck on ice vs. on a street • Impact of a bat on a baseball – The bat imparts a force to the ball and sends it flying in the opposite direction Question? • A ball is attached to a string and I spin it
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 6

lecture_tan9 - Key Concepts: Lecture 9 Describing Motion...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online