PPT-Inertia and Newton’s First Law of Motion

Lesson 14 February 10 th 2011 DEMO TIME Can you drop the penny in the flask by only touching the ring Question When you are standing on the train and it suddenly starts to move what happens. To Cambridge University . sizar. in 1661 . Plague forced university to close – Newton goes home to . Woolsthorp. Annus. mirabilis of 1666. Calculus. Problem of the Moon. Dominated by Aristotle. Newton read Descartes, Galileo, . Forces act on you all the time. . If . you surf, you can feel many forces pushing and pulling you in different directions. . Gravity . always pulls you down, towards planet Earth. . This . force can be balanced by the support of the surfboard acting upwards. . . . Lecture. 2. . Mechanics (1). Why do things move?. Historical Perspective. 1. Aristotle. 350 BC. Was the final word on any scientific question. Influenced scientific thought until the end of the 17. Simple version of Newton’s three laws of motion. Newton’s Laws and the Mousetrap Racecar. 3. rd. Law: “for every action there is an equal and opposite reaction”. Is more mass a good thing or a bad thing for a mousetrap racecar to go far?. Newton’s Laws. Isaac Newton. The man, myth, the legend…while you spend your time on Facebook, Newton spent his studying the behavior of objects in MOTION.. His conclusion…anything in motion is going to follow 1 of the 3 basic . The Law of Inertia. The first law says that an object at rest tends to stay at rest, and an object in motion tends to stay in motion (with the same direction and speed) unless acted upon by an unbalanced force.. Lecture. 2. . Mechanics (M1). Why do things move?. Historical Perspective. 1. Aristotle. 350 BC. Was the final word on any scientific question. Influenced scientific thought until the end of the 17. Forces. Forces can be thought of as pushes and pulls. Examples. You exert a force on a door to open it (a push). Gravity exerts a force on you which holds you to the surface of the earth (a pull). Forces. University of Michigan. Physics Department. Mechanics and Sound . Intro . Labs. Inclined Plane Experiment. Although it may seem daunting, rotational motion is fairly straightforward. In many ways it is analogous to the linear motion that you have studied previously. Rotational motion can be examined using the same principles of energy and momentum conservation that you have used previously. The equations that accompany these laws take a slightly different form, but at their root, they are based on the same physical principles. So begins your three part study of rotational motion which includes this lab, the rotating bar in . 1. st. Law of Motion. Inertia. An object will remain at rest or in constant motion unless acted upon by an unbalanced force. . “The Old Tablecloth Trick”. How does this comic relate to Inertia? . Forces. We have learned that forces . either pushes or pulls.. They come in many varieties:. Gravity & Normal. Kinetic & Static Friction. Electrical & Magnetic. Air resistance. Tension. Nuclear Force. LAWS OF MOTION Newton ’ s First Law an object at rest remains at rest and an object in motion maintains its velocity (stays in motion) unless it experiences an unbalanced force (outside force). Aka Law of Inertia Acceleration, Force, and Newton’s Laws Demonstration Watch what happens when I bounce a tennis ball on the desk. What happens to its position? Direction? What happens to its speed? What happens to its velocity? Dynamics I Forces & Newton’s First Law 4 Natural Forces Gravity : acts between all masses in the universe and has “infinite” range Electromagnetic (EM) Force : acts between electrically charged particles and “magnetically charged” poles