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PHYS 114 Midterm: ME-UWA114A172T-E1(FRC,N23)Sol

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turquoisegnu128
31 Jan 2019
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UW
Department
Physics
Course
PHYS 114
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All

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Name ______________________________________ student id _______________ score________ last first. [25 points total] blocks a, b, and c are being pushed to the right across a frictionless floor by a hand applying a constant horizontal force as shown. The masses of blocks a, b, and c are 2m, 3m, and m, respectively. Call this situation case 1: [10 pts] draw a free-body diagram for each of the three boxes. Frictionless floor (1) the type of force, (2) the object exerting the force, and (3) the object on which the force is exerted. Note: you do not need to worry about the relative magnitudes of the forces. Ba: [5 pts] in the spaces at right, sketch vectors representing the net force on each of the three blocks. Be sure your vectors show the correct relative magnitude and direction of each net force.

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Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

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Related Questions

Part A.

Blocks A, B, and C are pushed across a frictionless table by a hand that exerts a constant horizontal force. Block A has mass 2M block B has mass 3M and block C has mass M.

a) Draw separate free-body diagrams for each of the three blocks. Clearly label the forces. in the spaces below, draw vectors to represent the net force on each block.
b) Draw the vectors with correct relative magnitudes.

Part B.

Blocks A and B are at rest on a level, frictionless surface. Block B is attached to an ideal massless spring of constant k, which is initially at its equilibrium length. Block B has greater mass than block A (mB > mA).

During the interval from t1 to t2 a hand pushes block A to the left with a constant force of magnitude F0, compressing the spring a distance as shown. At time t2, both blocks again have a speed of zero.

Consider system A consisting of block A and system BS consisting of block B and the spring.

c) During the interval from t1 to t2, is the absolute value of the net work done on system BS by external forces, greater than, less than, or equal to that done on system A by external forces?

 

 

At some later time, the hand is holding the blocks at rest with the spring compressed a distance d0. At time t3 the hand releases the blocks. At time t4, the spring returns to its equilibrium length and both blocks have speed vf, as shown.

Consider the interval from t3 to t4:

d) Is the change in kinetic energy of system BS greater than, less than, or equal to that of system A?
e) Is the change in total energy of system BS positive, negative, or zero?

c) During the interval from t1 to t2, is the absolute value of the net work done on system BS by external forces, greater than, less than, or equal to that done on system A by external forces?

 

 

At some later time, the hand is holding the blocks at rest with the spring compressed a distance d0. At time t3 the hand releases the blocks. At time t4, the spring returns to its equilibrium length and both blocks have speed vf, as shown.

Consider the interval from t3 to t4:

d) Is the change in kinetic energy of system BS greater than, less than, or equal to that of system A?
e) Is the change in total energy of system BS positive, negative, or zero?

1). A 3-kg mass has an acceleration of (4.0i - 3.0j )m/s^2. Onlytwoforces act on the mass. If one of the forces is ( 2.0i - 1.4j)N,what is the magnitude of the the other force ?


2). Two blocks are accelerated across a horizontalfrictionlesssurface . Frictionless forces keep the two blocks fromslidingrelative to each other, and the two move with the sameacceleration.If F= 1.2 N and M = 1.0 kg, (a) draw free bodydiagram for eachblock and (b) determine the horizontal component (frictional force) of the large block on the small block.

3). Two blocks connected by a string are pulled acrossahorizontal surface by a force applied to one of the blocks.Thecoefficient of kinetic friction between the blocks and thesurfaceis 0.25. (a) Draw a free-body diagram for each block. (b) Ifeachblock has an acceleration of 2.0 m/s^2 to the right, what isthemagnitude F of the applied forces ?