Transcript force with inclines - Kleins

Do Now
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A box has a mass of
25 kg and is on a
wooden desk. If we
push the box with
750 N of force we get
a net force of 350 N.
What is the Force of
friction?
What is the
Coefficient of
Friction of the desk?
Forces on an Incline
Plane
Incline Plane
• We first have to
understand what
an incline plane is
• Any surface that is
raised to an angle
other than 180
degrees (flat) is an
incline plane
• Ramps are
common examples
Force on an incline
plane
F normal
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There are many
forces acting on
objects that are on
an incline
It is important that
before we do any
calculations that we
label these forces
Fx
Fy
F gravity
Force on an incline
plane
F normal
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F gravity will be the
same formula that F
gravity always is
F gravity = m(g)
Fx
Fy
F gravity
Force on an incline
plane
F normal
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Before we find out
what Fy, Fx, and F
normal are going to
be we should rotate
our picture to
something that is
easier to understand
Fx
Fy
F gravity
Force on an incline
plane
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Now that we are in a
more understandable
position we can see
that Fy = F normal
Force on an incline
plane
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We can also figure
out what angle we
are going to use in
our trigonometric
functions which will
allow us to know
which functions to
use as well
Force on an incline
plane
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F normal =
(m)(g)(cos theta)
Fx = (m)(g)(sin theta)
Try It!
F normal
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If a 75 kg box is on
an incline plane that
is raised to an angle
of 35 degrees what
are the X and Y
components of force
as well as the force
of gravity of the
object?
Fx
Fy
F gravity