םיליגרת ףד 5

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5 ‫דף תרגילים‬
1)
CONTRIBUTIONS/e_10_8_081.html
Newton Laws
Two blocks are in contact on a frictionless table, as shown below. A horizontal force is applied to
one block, as shown below.
(a) If m1 = 2.3 kg, m2 = 1.2 kg, and F = 3.2 N, find the force of contact between the two blocks.
(b) Show that if the same force F is applied to m2 rather than to m1, the force of contact between the
blocks is 2.1 N, which is not the same value de¬rived in (a). Explain.
2)
CONTRIBUTIONS/e_10_8_108.html
A 1.34-kg ball is attached to a rigid vertical rod by means of two massless strings each 1.70 m long.
The strings are attached to the rod at points 1.70 m apart.
The system is rotating about the axis of the rod, both strings being taut and forming an equilateral
triangle with the rod, as shown below.
The tension in the upper string is 35.0 N.
(a) Find the tension in the lower string.
(b) Calculate the net force on the ball at the instant shown in the figure.
(c) What is the speed of the ball?
http://physweb.bgu.ac.il/COURSES/PHYSICS1_BioTech/2007B/Ex/ex_05.php
30/05/2007
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3)
CONTRIBUTIONS/e_10_4_006.html
‫חרוז מסתחרר‬
‫י‬/‫ מצא‬.
‫ המסתובבת במהירות זוויתית‬,
‫המושחל על טבעת אנכית חסרת חיכוך בעלת רדיוס‬
‫נתון חרוז בעל מסה‬
.‫את הזווית בה יתמקם החרוז‬
4)
CONTRIBUTIONS/e_10_8_103.html
The two blocks, m = 16 kg and M = 88 kg, shown in the figure below are free to move.
The coefficient of static friction between the blocks is 0.38, but the surface beneath M is frictionless.
What is the minimum horizontal force F required to hold m against M?
http://physweb.bgu.ac.il/COURSES/PHYSICS1_BioTech/2007B/Ex/ex_05.php
30/05/2007
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5)
CONTRIBUTIONS/e_10_8_105.html
A 4.40-kg block is put on top of a 5.50-kg block. In order to cause the top block to slip on the
bottom one, held fixed, a horizontal force of 12.0 N must be applied to the top block.
The assembly of blocks is now placed on a horizontal, frictionless table, as shown below Find
(a) the maximum horizon¬tal force F that can be applied to the lower block so that the blocks will
move together,
(b) the resulting acceleration of the blocks, and
(c) the coefficient of static friction between the blocks.
http://physweb.bgu.ac.il/COURSES/PHYSICS1_BioTech/2007B/Ex/ex_05.php
30/05/2007
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6)
CONTRIBUTIONS/e_10_8_109.html
A very small cube of mass m is placed on the inside of a funnel (see figure below) rotating about a
vertical axis at a constant rate of w revolutions per second.
The wall of the funnel makes an angle theta with the horizontal. The coefficient of static friction
between cube and funnel is mu and the center of the cube is at a distance r from the axis of rotation.
Find the
(a) largest and
(b) smallest values of w for which the cube will not move with respect to the funnel.
http://physweb.bgu.ac.il/COURSES/PHYSICS1_BioTech/2007B/Ex/ex_05.php
30/05/2007
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http://physweb.bgu.ac.il/COURSES/PHYSICS1_BioTech/2007B/Ex/ex_05.php
30/05/2007