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Lecture Notes

# Lecture Notes - Chapter 4 Problems 1 A man pushes against...

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Chapter 4 Problems: 1) A man pushes against four boxes, which rest on a frictionless surface. a) Draw a diagram showing all of the forces acting on box D. Label each force with its type and the object that exerts the force. This is a “free body diagram”. b) Apply the Second Law to create an equation for the acceleration of box D. This is the “equation of motion”. c) Repeat (a) and (b) for boxes A, B, and C. d) The boxes move together. Write the equation of motion for the system of four boxes. A B C D F

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2)A 100-kg man balances a 50-kg box on his head. He bends his knees a bit, and then pushes on the ground so that he moves a distance of 25 cm as he accelerates to a final upward speed of 3 m/s a) What is the acceleration of the man-box system? b) What force does the man exert on the box? c) What force does the ground exert on the man? d) After the man and box leave the ground…. i. What is the net force on the box? ii. What is the acceleration of the box?
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Lecture Notes - Chapter 4 Problems 1 A man pushes against...

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