physics the five force equation presented by denise jenke
TRANSCRIPT
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Physics
The Five Force Equation
Presented by Denise Jenke
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Newton’s Second Law of Motion
Fnet = maWhat does it mean?
What do the symbols stand for?
How does this relate to the Five Force Equation?
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Fnet = net force
Fnet = maWhat does it mean?
A net force causes a mass to accelerate
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Fnet = ma
What do the symbols stand for?
Fnet = net force; the vector sum of all forces acting on an object (Newton-N)
m = mass (kilogram-kg)
a = acceleration; the rate of change of velocity (m/s2)
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The Five Force Equation
Fnet = Fg + Fn + Fa + Ff
BUT…..what does it mean????
Fg
Fn
Ff Fa
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Fnet = Fg + Fn + Fa + Ff
Fg = gravitational force
Force due to the Earth’s gravity on the object
Always down
Fg
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Fnet = Fg + Fn + Fa + Ff
Fg = mgg = acceleration due to the Earth’s gravity (-9.8 m/s2)
Fg
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Fnet = Fg + Fn + Fa + Ff
Fn = normal force
The force of the surface on the object
Support forceFn
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Fnet = Fg + Fn + Fa + Ff
Is normal force the action/reaction force of gravitational force?
Fn
Fg
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Fnet = Fg + Fn + Fa + Ff
Fa = applied force
Push or pull on an object
Force applied to the object
Force can be applied in any direction
Fa
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Fnet = Fg + Fn + Fa + Ff
Ff = force of friction
Force that opposes the motion of an object
Ff
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Fnet = Fg + Fn + Fa + Ff
Friction is caused by the rubbing of two surfaces
Surfaces must be touching and must want to move
Ff
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Fnet = Fg + Fn + Fa + Ff
Types of Frictional Force:
Static Friction
Sliding Friction
Ff
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Static Friction
Frictional force between two object in contact that keep them stationary (relative to each other)It is the force that keeps objects from movingForce acts parallel to direction of motionOnly exists if a force is being applied to one of the objects
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Sliding Friction
Frictional force between two objects in contact and in motion (relative to each other)
It is the force that acts when objects are moving
Force acts parallel to the direction of motion
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The Five Force Equation
Fnet = Fg + Fn + Fa + Ff
BUT…..what does it mean????
Fg
Fn
Ff Fa
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The Five Force Equation
SO….
Which forces cause motion?
Which forces cause acceleration?
Fg
Fn
Ff Fa
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The Five Force Equation
Stay tuned for.. Using the Five Force Equation
Fg
Fn
Ff Fa