Transcript Newton’s 3rd Law of Motion

rd
3
Newton’s
Law of Motion
Ch 3 Sect 3
3rd Law

To every action force there is an
equal and opposite reaction force
• Ex #1 Person jumping on a trampoline


Action Force = Person pushing down on
trampoline causes it to stretch
Reaction Force = Trampoline goes back to
its original shape and shoots you up
3rd Law (continued)
• Ex #2 Person Swimming


Person pushes on the water (action force)
Water pushes back causing the swimmer to
propel forward (reaction force)
• Ex #3 Rocket Propulsion
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
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Explosion of gases in a sealed chamber
leave out the back end (action force)
Sealed chamber moves forward (reaction
force)
Rocket Propulsion
Momentum

Property an object has because of its mass
and velocity

How much umph or force an object has that
is moving and has mass
More mass = more momentum
 More velocity = more momentum
 P = Momentum, M = Mass, V = Velocity
 P = M (kg) x V (m/s2)
