Question

A box with mass of 5 kg is pushed with a force of 15 N on a rough horizontal floor. Find the friction force (assume that the static friction coefficient µs=0.4 ).

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Abdul-Rahim Taysir

Answer #1

The mass of the box is .

Hence the weight of the box acting vertically downward is
, where
is the gravitational acceleration and
.

The normal force or the reaction force on the box acting vertically
upward is
.

Hence the frictional force opposing the motion of the box is

,

where is the friction coefficient of the surface.

In this case, .

Hence .

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Abdul-Rahim Taysir

You learned about the legal context of HRM in the United
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A woman exerts a horizontal force of 107 N on a box with a mass
of 40.2 kg.
(a)
If the box doesn't move, what's the magnitude of the static
friction force (in N)?
N
(b)
What is the minimum possible value of the coefficient of static
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A box of mass m = 3 kg is pushed against a vertical
wall, with a force that gets weaker over time,
Fa = 10 - t N. After 10 seconds,
Fa remains 0 Newtons (the force does not become
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and ?k = 0.4

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18.
A 34.5 kg box initially at rest is pushed 5.75 m along a rough,
horizontal floor with a constant applied horizontal force of 150 N.
If the coefficient of friction between box and floor is 0.300, find
the following.
(a) the work done by the applied force
___J
(b) the increase in internal energy in the box-floor system due to
friction
___J
(c) the work done by the normal force
___J
(d) the work done by the gravitational force...

A factory worker exerts a 100 N horizontal pushing force on a
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N. The coefficient of friction for the box is .2. The box is 4 m
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What is the difference of the future amounts of the annuity due
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Abdul-Rahim Taysir

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