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### lecture4

Course: PHYS 606, Fall 2008
School: UVA
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Word Count: 298

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of University Virginia Department of Physics Physics 606: How Things Work II Lecture #4 Slides: Force and Work Physics Concept Net Force The sum of all forces on an object. Determines object's acceleration. Newton's Third Law For every force that one object exerts on a second object, there is an equal but oppositely directed force that the second object exerts on the first object. Experiment: If you push...

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of University Virginia Department of Physics Physics 606: How Things Work II Lecture #4 Slides: Force and Work Physics Concept Net Force The sum of all forces on an object. Determines object's acceleration. Newton's Third Law For every force that one object exerts on a second object, there is an equal but oppositely directed force that the second object exerts on the first object. Experiment: If you push on a friend who is moving away from you, how will the force you exert on your friend compare to the force your friend exerts on you? 1. You push harder 2. Your friend pushes harder 3. The forces are equal in magnitude Forces Present: 1. On ball due to gravity (its weight) 2. On ball due to support from table 3. On table due to support from ball All three forces have the same magnitude for the stationary ball Forces Present: 1. On ball due to gravity (its weight) 2. On due ball to support from table 3. On table due to support from ball Forces Present: 1. 2. 3. 4. On earth due to gravity from the ball On ball due to gravity from the earth On ball due to support from table On table due to support from ball Pair Pair Pair Since the ball doesn't accelerate, 2 and 3 must cancel perfectly 1 Question: Can a ball ever push downward on a table with a force greater than the ball's weight? Two Crucial Notes: While the forces two objects exert on one another must be equal and opposite, the net for...

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UVA - PHYS - 606
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Welcome to the Phys 606 Chat Room 8-9 PM Apr 16 You are free to type text in the text line anytime. If you want to speak, Click on the hand and I will give you the floor. We all should do this just to say hello Then I will review selected topics.
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1997MNRAS.289.766H1997MNRAS.289.766H1997MNRAS.289.766H1997MNRAS.289.766H1997MNRAS.289.766H1997MNRAS.289.766H1997MNRAS.289.766H1997MNRAS.289.766H1997MNRAS.289.766H1997MNRAS.289.766H1997MNRAS.289.766H1997MNRAS.289.766H1997MNRAS.
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1989ApJ.343.1D1989ApJ.343.1D1989ApJ.343.1D1989ApJ.343.1D1989ApJ.343.1D1989ApJ.343.1D1989ApJ.343.1D1989ApJ.343.1D1989ApJ.343.1D1989ApJ.343.1D1989ApJ.343.1D1989ApJ.343.1D1989ApJ.343.1D1989ApJ.343.1D1989ApJ.343.1D1989ApJ.34
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1989ApJ.343.1D1989ApJ.343.1D1989ApJ.343.1D1989ApJ.343.1D1989ApJ.343.1D1989ApJ.343.1D1989ApJ.343.1D1989ApJ.343.1D1989ApJ.343.1D1989ApJ.343.1D1989ApJ.343.1D1989ApJ.343.1D1989ApJ.343.1D1989ApJ.343.1D1989ApJ.343.1D1989ApJ.34
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1995ARA&amp;A.33.581K1995ARA&amp;A.33.581K1995ARA&amp;A.33.581K1995ARA&amp;A.33.581K1995ARA&amp;A.33.581K1995ARA&amp;A.33.581K1995ARA&amp;A.33.581K1995ARA&amp;A.33.581K1995ARA&amp;A.33.581K1995ARA&amp;A.33.581K1995ARA&amp;A.33.581K1995ARA&amp;A.33.581K1995ARA&amp;A.33.581K199
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1976ApJ.203.297S1976ApJ.203.297S1976ApJ.203.297S1976ApJ.203.297S1976ApJ.203.297S1976ApJ.203.297S1976ApJ.203.297S1976ApJ.203.297S1976ApJ.203.297S1976ApJ.203.297S
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1983QJRAS.24.267H1983QJRAS.24.267H1983QJRAS.24.267H1983QJRAS.24.267H1983QJRAS.24.267H1983QJRAS.24.267H1983QJRAS.24.267H1983QJRAS.24.267H1983QJRAS.24.267H1983QJRAS.24.267H1983QJRAS.24.267H1983QJRAS.24.267H1983QJRAS.24.267H198
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1978ApJ.224.132B1978ApJ.224.132B1978ApJ.224.132B1978ApJ.224.132B1978ApJ.224.132B1978ApJ.224.132B1978ApJ.224.132B1978ApJ.224.132B1978ApJ.224.132B1978ApJ.224.132B1978ApJ.224.132B
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1991ARA&amp;A.29.581Y1991ARA&amp;A.29.581Y1991ARA&amp;A.29.581Y1991ARA&amp;A.29.581Y1991ARA&amp;A.29.581Y1991ARA&amp;A.29.581Y1991ARA&amp;A.29.581Y1991ARA&amp;A.29.581Y1991ARA&amp;A.29.581Y1991ARA&amp;A.29.581Y1991ARA&amp;A.29.581Y1991ARA&amp;A.29.581Y1991ARA&amp;A.29.581Y199
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1991ARA&amp;A.29.581Y1991ARA&amp;A.29.581Y1991ARA&amp;A.29.581Y1991ARA&amp;A.29.581Y1991ARA&amp;A.29.581Y1991ARA&amp;A.29.581Y1991ARA&amp;A.29.581Y1991ARA&amp;A.29.581Y1991ARA&amp;A.29.581Y1991ARA&amp;A.29.581Y1991ARA&amp;A.29.581Y1991ARA&amp;A.29.581Y1991ARA&amp;A.29.581Y199
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1981AJ.86.1825B1981AJ.86.1825B1981AJ.86.1825B1981AJ.86.1825B1981AJ.86.1825B1981AJ.86.1825B1981AJ.86.1825B1981AJ.86.1825B1981AJ.86.1825B1981AJ.86.1825B1981AJ.86.1825B1981AJ.86.1825B1981AJ.86.1825B1981AJ.86.1825B1981AJ.86.18
UVA - PHYS - 356
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