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Lecture02_Pushkar

# Lecture02_Pushkar - Physics 220 Help center is in room 11A...

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Physics 220 Help center is in room 11A There are labs starting already this week. Lab syllabus will be handed to you on your first lab. Now it is available online as well. Lecture 2 Purdue University, Physics 220 1

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Lecture 2 Purdue University, Physics 220 2 Lecture 02 Motion, Forces, and Newton’s Laws Textbook Sections 2.2-2.4 PHYSICS 220 Mechanics is the area of physics which is concerned with the motion of objects. Two questions need to be answered to understand mechanics What causes motion? Given a particular situation, how will an object move?
Definition of Motion Concepts needed Position Velocity Acceleration Start by considering “one-dimensional motion” = motion along the straight line

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Representations of Motion A - shows a motion Multiple images of a hockey puck traveling across an icy surface B – Motion diagram - shows a position – time graph of the motion The dots correspond to the distance between the 0 on X- axis to the center of the puck at given time. Motion diagram displacement= change in position during a particular time interval
Lecture 1 Purdue University, Physics 220 5 Given the train’s initial position and its final position what is the displacement of the train? A) -26 km B) -29 km C) +29 km D) -23 km E) +23 km Question

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Velocity (vector) = the distance that an object travels (m) per second (s); v= x/ t. What we can say about the direction of vector v ?
Lecture 2 Purdue University, Physics 220 7 Velocity vs Speed Velocity is a vector Only depends on the displacement between the initial and final positions

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