© 2015 Pearson Education, Inc.

© 2015 Pearson Education, Inc.

© 2015 Pearson Education, Inc.

© 2015 Pearson Education, Inc.

Draw the FBD in each situation and write the corresponding equations of motion. a) They move at constant speed. b) They are accelerated. c) How different is the Normal Force in each case?

© 2015 Pearson Education, Inc.

© 2015 Pearson Education, Inc.

Are these systems all the same? How are they different? Do the corresponding FBD and find their accelerations. How does the tension in the cord changes?

© 2015 Pearson Education, Inc.

© 2015 Pearson Education, Inc.

Consider the systems with the same masses and ideal pulleys and ropes. What is the tension in each case?

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Consider the situations above. What is the tension T in each case? Physically, for the tension T, are this two situations different? Why?

© 2015 Pearson Education, Inc.

All the surfaces are frictionless and the pulley is massless and frictionless. 1. Draw the corresponding FBD for each body and find their accelerations. 2. Find the acceleration for each block and the tension in the cord?

The floor is frictionless and the pulley is massless and frictionless, but there is friction between the two blocks. 1. In which direction is the kinetic friction on block 1? 2. Draw the corresponding FBD for each body and find their accelerations. 3. Find the acceleration for each block and the tension in the cord?

F

© 2015 Pearson Education, Inc.

All the surfaces are frictionless and the pulley is massless and frictionless. 1. Draw the corresponding FBD for each body and find their accelerations. 2. Find the acceleration for each block and the tension in the cord? 3. What conditions apply to masses m1 & m2 for the acceleration to be in one

direction (say down the plane), or in the opposite direction?

© 2015 Pearson Education, Inc.

All the surfaces are frictionless and the pulley is massless and frictionless. 1. Draw the corresponding FBD for each body and find their accelerations. 2. Find the acceleration for each block and the tension in the cord? 3. What conditions apply to masses m1 & m2 for the acceleration to be in one

direction (say down the plane), or in the opposite direction?

m1

m2

ɸ1 ɸ2

© 2015 Pearson Education, Inc.

All the surfaces are frictionless and the pulley is massless and frictionless. 1. Draw the corresponding FBD for each body and find their accelerations. 2. Find the acceleration for each block and the tension in the cord? 3. What conditions apply to masses m1 & m2 for the acceleration to be in one

direction (say down the plane), or in the opposite direction?

© 2015 Pearson Education, Inc.

The block is initially at rest, so initially the friction force is static friction. If the 12 N pushing force is too strong, the box will begin to move up the wall. If it is too weak, the box will begin to slide down the wall. And if the pushing force is within the proper range, the box will remain stuck in place. Find out which is the case?

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All the surfaces are frictionless. 1. Draw the corresponding FBD for each body and find the tensions in 1 &2.

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1. Draw the corresponding FBD for the mass and find the tension in the cord.

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m1

m2

h

The ideal system is released from rest. If it takes 1s for mass m2 to reach the floor, find the relationship between the masses m1 & m2.

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Drag Force

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The terminal velocity of a Styrofoam ball is -15m/s. Suppose the ball is shot straight down with an initial velocity of 30m/s. Which velocity time graph is correct? Describe in describe detail why you choose/discard each option.

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A 200Kg set used in a play is stored in the loft above the stage. The rope holding the set passes up and over a pulley, then is tied backstage. The director tells a 100Kg stagehand to lower the set. When he unties the rope, the set falls and the unfortunate man is hoisted into the loft. What is the stagehand’s acceleration?

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Rank in order, from largest to smallest, the size of the friction forces fA to fE in the five different situations (one or more friction forces could be zero). The box and the floor are made of the same materials in all situations.