Physics II workshop_Part_26

# Physics II workshop_Part_26 - 54 The Modified Atwood...

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Unformatted text preview: 54 The Modified Atwood Machine: Using Newton’s Second Law A cart of mass m 1 is connected to a mass m 2 by an ideal string passing over an ideal pulley, as shown. The friction on the horizontal surface is negligible. First make predictions for the cases below, then draw free body diagrams and predict the result based on the diagram! You will make observations as described on the reverse side. Case 1 : You put your hand on the cart of mass m 1 and hold it at rest. (i) What is the direction of the acceleration of m 1 , left, right or a=0? Prediction—left, right, zero Observation--Direction and value (with uncertainty) (ii) Compare the string tension to the force of gravity on mass m 2 — is T >m 2 g , T =m 2 g , or T < m 2 g? Initial Prediction Based on Free Body Diagram Observation--Direction and value (with uncertainty) m 2 g = T = Case 2 . Starting from the situation in case 1, you quickly remove your hand. (i) After you remove your hand , what is the direction of the acceleration of m 1 ? Prediction: left, right, zero Observation--Direction and value (with uncertainty) (ii) After you remove your hand , compare the tension in the string to the force of gravity on mass m...
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Physics II workshop_Part_26 - 54 The Modified Atwood...

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