178% @uO 11:46• ZAIN IQ Il.H.W NEWTONS LAW.docxFebruary 7,2021H.W MECHANICS PHYSICSExample 5.13Friction in horizontal motionYou want to move a 500-N crate across a level floor. To start thecrate moving, you have to pull with a 230-N horizontal force.Once the crate "breaks loose" and starts to move, you can keep itmoving at constant velocity with only 200 N. What are the coeffi-cients of static and kinetic friction?Example 5.15 Minimizing kinetic frictionIn Example 5.13, suppose you move the crate by pulling upwardon the rope at an angle of 30° above the horizontal. How hard mustyou pull to keep it moving with constant velocity? Assume thatHk = 0.40.Example 5.16Toboggan ride with friction ILet's go back to the toboggan we studied in Example 5.10. Thewax has worn off, so there is now a nonzero coefficient of kineticfriction uk. The slope has just the right angle to make the tobogganslide with constant velocity. Find this angle in terms of w and uk.Example 5.17Toboggan ride with friction IIThe same toboggan with the same coefficient of friction as inExample 5.16 accelerates down a steeper hill. Derive an expres-sion for the acceleration in terms of g. a, pk, and w.5.7 . Find the tension in*Aeach cord in Fig. E5.7 if theweight of the suspended object is w.Figure E5.7(a)(b)30° 45°A4560°5.15 .. Atwood's Machine.A15.0-kg load of bricks hangs fromFigure E5.15

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You want to move a 500-N crate across a level floor. To start the crate moving, you have to pull with a 230-N horizontal force. Once the crate "breaks loose" and starts to move, you can keep it moving at constant velocity with only 200 N. What are the coeffi- cients of static and kinetic friction?

You want to move a 500-N crate across a level floor. To start the crate moving, you have to pull with a 230-N horizontal force. Once the crate "breaks loose" and starts to move, you can keep it moving at constant velocity with only 200 N. What are the coeffi- cients of static and kinetic friction?

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Newton's Second Law

Newton’s laws of motion describe the relationship between the motion of an object and forces acting on it. Newton’s law of motion has two types as follows:

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178% @
uO 11:46
• ZAIN IQ Il.
H.W NEWTONS LAW.docx
February 7,
2021
H.W MECHANICS PHYSICS
Example 5.13
Friction in horizontal motion
You want to move a 500-N crate across a level floor. To start the
crate moving, you have to pull with a 230-N horizontal force.
Once the crate "breaks loose" and starts to move, you can keep it
moving at constant velocity with only 200 N. What are the coeffi-
cients of static and kinetic friction?
Example 5.15 Minimizing kinetic friction
In Example 5.13, suppose you move the crate by pulling upward
on the rope at an angle of 30° above the horizontal. How hard must
you pull to keep it moving with constant velocity? Assume that
Hk = 0.40.
Example 5.16
Toboggan ride with friction I
Let's go back to the toboggan we studied in Example 5.10. The
wax has worn off, so there is now a nonzero coefficient of kinetic
friction uk. The slope has just the right angle to make the toboggan
slide with constant velocity. Find this angle in terms of w and uk.
Example 5.17
Toboggan ride with friction II
The same toboggan with the same coefficient of friction as in
Example 5.16 accelerates down a steeper hill. Derive an expres-
sion for the acceleration in terms of g. a, pk, and w.
5.7 . Find the tension in
*A
each cord in Fig. E5.7 if the
weight of the suspended object is w.
Figure E5.7
(a)
(b)
30° 45°
A
45
60°
5.15 .. Atwood's Machine.A
15.0-kg load of bricks hangs from
Figure E5.15

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