lecturenotes-Jan27

# lecturenotes-Jan27 - First Exam instructions First Exam...

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First Exam instructions
First Exam instructions

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Equation Sheet Posted Physics
Quick Review Force and Motion - I (Chapt. 5) - gravitational - tension - normal Force and Motion - II (Chapt. 6) - friction 1 st Law - 2 nd Law - vector 3 rd Law - (i.e. interaction pairs) F net = F i INERTIA stay in motion(rest) F net = m a F A B = F B A Newton’s laws F net , x = ma x F net , y = ma y F net , z = ma z

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Rules for the Application of Newton’s Laws of Motion 1. Choose the system to be studied. 2. Make a simple sketch of the system. 3. Choose a convenient coordinate system. 4. Identify all the forces that act on the system. Label them on the diagram. 5. Apply Newton’s laws of motion to the system.
Solving Force Problems 1) Read the problem and draw a picture. 3) Draw a convenient coordinate system and resolve forces into components. 4) Define direction of acceleration, if any 6) Write Force equations for each direction… Solve Newton’s 2 nd law (vector) for each system 2) Draw a free-body diagram showing all forces acting on body. 5) Subdivide into differing systems if needed

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Example: Accelerating Masses 1) Draw a free-body diagram 2) Draw coordinates & resolve forces 3) Define direction of acceleration: I think the heavier block will go down The forces don’t balance. What is the acceleration, a? a=? a=? If the 3m block goes down, it accelerates. Now write your force equations for both masses: for mass m: for mass M=3m: Ma = Mg T 3 ma = 3 mg T ma = T mg 3 ma = 3 mg T ma = T mg 4 ma = 2 mg a = 1 2 g
A block of mass M is hung by ropes as shown. The system is in equilibrium. The point O represents the knot, the junction of the three ropes. Which of the following statements is true concerning the magnitudes of the three forces in equilibrium? a) F 1 + F 2 = F 3 b) F 1 = F 2 = 0.5 × F 3 c) F 1 = F 2 = F 3 d) F 1 > F 3 e) F 2 < F 3 Questions

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A force of magnitude F pushes a block of mass 2 m , which in turn pushes a block of mass m as shown. The blocks are accelerated across a horizontal, frictionless surface. What is the magnitude of the force that the smaller block exerts on the larger block?
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## This note was uploaded on 05/20/2011 for the course PHYS 2101 taught by Professor Grouptest during the Spring '07 term at LSU.

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lecturenotes-Jan27 - First Exam instructions First Exam...

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