Transcript Newton`s Second Law

Newton’s Second Law
Section 3-1
Force and Acceleration
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The greater the force is that is applied
to an object,
F=
Force and Mass
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The acceleration of an object depends
on its
as well as the
exerted
on it
Throw a baseball and a softball
F=
Newton’s Second Law
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F=
The net force acting on an object
causes the object to
in the
direction of the force.
Force will be labeled in
– Mass = kg
– Acceleration = m/s2
You are pushing a friend on a sled.
You push with a force of 40
newtons. Your friend and the sled
together have a mass of 80kg.
What is the acceleration of your
friend on the sled?
A tennis ball undergoes an acceleration
of 5,500m/s2. How much force would
the tennis racket have to exert to give
the ball this acceleration? The ball has a
mass of .06kg.
Friction
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Force that
What happens to a skate board after
you give it a push?
Why does it slow down and eventually
stop?
Would the type of surface make a
difference?
Amount of Friction
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The amount of friction depends on two
things.
–
–
Three types of Friction
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Static Friction
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The friction
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Getting the object moving
Sliding Friction
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Force that
– Once you have the object moving, there
is still friction.
Rolling Friction
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The friction between
– Put sand on the ice when your car is
stuck.
– Usually much less than static or sliding
friction.
Air Resistance
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Force that acts
Crumpled paper VS Flat paper
Surface Area
Air Resistance depends on:
–
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Terminal Velocity
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The
that a
falling object can reach.
The point where the forces acting on
the object are