Conceptual Physics PHY2020 Week 1 Notes
Conceptual Physics PHY2020 Week 1 Notes Phy 2020
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This 4 page Class Notes was uploaded by Annette Moncada Peon on Saturday August 29, 2015. The Class Notes belongs to Phy 2020 at University of South Florida taught by Dr. Gauri R. Pradhan in Fall 2015. Since its upload, it has received 334 views. For similar materials see Conceptual Physics in Physics 2 at University of South Florida.
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Date Created: 08/29/15
Conceptual Physics PHYZOZO Dr Gauri R Pradhan Week 1 Notes 1 2 3 4 5 6 7 8 What is Physics a The study of matter energy motion force and the interaction between them b It is fundamental science c It is the study of the fundamental principles of the universe d It is the foundation for the other sciences Measurement a A comparison or ratio of some physical quantity to the basic standard quantity of the same matter b Estimated magnitude of some attribute of a matter What is SI a It is the International System of units b Kilogramsecond mks system meter kilogram and second Scientific Method a Observation 1 Definitions and measurements b Hypothesis 1 Theoretical explanation of the observation or measurement of an object 11 Should be falsifiable c Prediction 1 Logical reasoning from the hypothesis or theory d Experiment 1 Test out the hypothesis or theory Vectors and Scalars a Vectors represented by an arrow it is magnitude and direction velocity force and weight b Scalars just magnitude mass volume and speed c The sum of 2 or more vectors 1 If going in the same direction you add arithmetically II If going in opposite directions you subtract arithmetically 111 If they do not act in the same or opposite direction them use the parallelogram rule IV If at right angles to each other use the Pythagorean theorem a2b2262 Derived Quantities a Quantities can be expressed in Basic units 1 SI unit for area is m 2 11 Speed in S1 is ms Precision vs Accuracy Reality of measurement a Precision exact or accurate Set of measurements of the same sample agree With their mean b Accuracybeing correct or precise Measurement that agrees With the standard value for the measurement Aristotle a Classification of motion I Natural Motion A Every matter in the universe has its place by the combination of the four elements i Earth ii Water iii Air iv Fire B Object will strive to get to its proper place if it is not there C Can be either straight up or straight down D In the case of celestial objects motion is circular II Violent Motion A Push or pulling forces B Imposed motion C Object did not push or pull but something else externally did the push or pull 9 Galileo Galilei a He formulated the laws of motion for objects in free fall b Experiment I He threw objects of different masses off the Leaning Tower of Pisa to compare their falls II He said that objects of different mass fall towards the ground at the same time when there is no air resistance III Moving object do not need force to keep moving in the absence of friction 10 About Inertia and Net Force a It all depends on the amount of matter in an object b It is the property of the matter that resist changes in motion c Gravitation d Free fall 11 Newton a He formulated the basic laws of mechanics b The law of universal gravitation c He invented a form or calculus d He made many observations that dealt with light and optics e Newton s first law of motion law of Inertia I An object at rest will stay at rest and an object in motion will stay in motion with a constant speed II It describes what happens in the absence of a force A Push or pull 12 Classes of Forces a Constant force contact between two objects b Field force contact is not required c Net force it is a combination of all the forces that change the state of motion of an object d Normal force upwards force e The SI unit for force is NewtonN I 1N1kg ms2 13 Net Force a When the net force of 0 it is called mechanical equilibrium b Being in a state of rest is only form of equilibrium c An object moving at a constant speed in a line is also an equilibrium 14 Linear Motion a Equation speeddistancetime b It is represented by mihr kmhr or ms c Instantaneous Speed it is the speed at any instant d Average speed 1 Equation average speed total distance covered time interval 15 Velocity a It is how fast and in what direction b Vector quantity c It uses the same units of speed d Constant velocity motion in line with a constant speed 16 Acceleration a Velocity can change by 1 Changing speed 11 Changing direction 111 Changing both b Acceleration is how quickly the velocity is changing c Equation acceleration change in velocitytime interval 17 Acceleration and velocity a If going in the same direction then it will speed up b If going in different directions it will slow down 18 Acceleration of freely falling objects a The objects fall under the in uence of gravity b The acceleration id directed downwards towards earth c The magnitude of free fall acceleration I The g is 980 ms2 A The g will decrease with increasing altitude B The g varies with location C The g is average at earth s surface
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