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NEWTON’S 3rd
LAW
Newton’s 3rd Law and Gravity
-Newton’s 1st law stated:
An object at rest tends to ____________________________
an object in motion tends to __________________________
as long as the forces are balanced.
-Newton’s 2nd law states (part 1):
When an unbalanced force acts on an object, the object will
___________________ in the direction that the unbalanced force
points.
-Newton’s 2nd law states (part 2):
Force = __________ x ___________________
-Newton’s 3rd law states:
-whenever an object exerts a force on a second object, the
second object exerts an ___________________ back on the
first object.
-Commonly stated as: For every action there is an equal and
opposite reaction.
-Rocket Motion
-On Earth we use air and Bernoulli’s principle to allow flight.
Since there is no air in space, how can a vehicle be propelled?
-Gravity
-Gravitational force (or gravity) is the force of ____________ that
exists between any two pieces of _____________.
-Gravity on Earth is always in affect, pulling all objects towards the
center of the Earth.
.
-The attraction of objects with the Earth is just one example of gravity at
work. According to Newton, any two objects that are composed of
matter attract each other, but there are rules for the strength of this
attraction.
-Universal Law of Gravitation states:
-the amount of gravitational force between two objects depends
on two things:
1) the ___________ of the objects and
2) the ___________ between the objects
-Big masses = _______ g. force
-Big distance = ________ g. force
-Big masses & short distance = _____________ g. force
-Small masses & large distance = _____________ g. force
-Weight
-Weight and mass are NOT the same.
-Mass is constant and measures the amount of _____________.
-Weight is just a measure of the _______________ on an object.
-since the larger mass = larger attraction, the more mass an
object has the more weight it has.
Weight = ____________ x _____________________
W = ___ x ___
- On Earth, gravity accelerates all objects at _________.
Ex. How much does an 80 kg man weigh on earth?
-However, since weight depends on the gravitational force
between the two objects (ex. yourself and Earth) your weight
will change if you leave Earth.
-Weight on the moon is about ______ of the weight on Earth.