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Chapter 11- 3
Newtons
rd
3
law
Newton’s 3 law
• 1. An object in motion/rest remains
unless acted on by a force
• 2. Force= mass x acceleration. The
amount of force needed to move an
object is equal to the amount of mass
in the object and how much you want
to accelerate it.
• 3. For every action there is an = and
opposite reaction
Newton’s
rd
3
Law
• If you push on an object gravity
and friction pull back on it. The
forces act in pairs but always in
opposite directions
• Forces do not act on the the
same object ex swimmer pg 361
rd
3
law continued
• The forces may be happening
at the same time but may not
have equal effects. Example a
bouncing ball never rebounds
as high as tossed down.
• Action/reaction is everywhere.
Momentum
• Momentum is how fast an
object moves due to its mass.
• A semi has more momentum
than a V w bug.
• To have momentum you must
be moving
Momentum con’t
• Forumula for momentum
• p=mv (p stands for
momentum, m stands for
mass, and v stands for velocity
• It takes force to change
Momentum
Momentum con’t
• Momentum is conserved or
saved. It is always transferred.
Like you can transfer it to heat
in friction when you break or
you can push a car forward
when you hit it.