Download Newton`s Second Law of Motion

Newton’s
nd
2
Law of Motion
Unit Standards
5.P.5A.1 Use mathematical and computational thinking to describe and predict
the motion of an object (including position, direction, and speed).
5.P.5A.2 Develop and use models to explain how the amount or type of force
(contact and non-contact) affects the motion of an object.
5.P.5A.3 Plan and conduct controlled scientific investigations to test the effects
of balanced and unbalanced forces on the rate and direction of motion
of objects.
5.P.5A.4 Analyze and interpret data to describe how a change of force, a change
of mass, or friction affects the motion of an object.
5.P.5A.5 Design and test possible devices or solutions that reduce the effects of
friction on the motion of an object.
What is Newton’s Second Law?
• Acceleration increases as your force increases
as long as your mass does not change.
• Acceleration decreases as your mass increases
as long as your force is not also changing.
What is Newton’s Second Law?
• Newton’s
Second Law of
Motion- the
unbalanced
force on an
object is equal
to the mass of
the object
multiplied by its
acceleration.
• F=m x a
What is Newton’s Second Law?
• Newton’s second law tells you that a total force of
1 Newton (force) will accelerate a 1 kg object
(mass) at 1 (m/s)/s (acceleration).
• Notice that a newton is equal to a kilogram times
a meter per second per second (kg(m/s)/s).
What is Newton’s Second Law?
• The direction of acceleration is always in the
same direction as the total force.
What is Newton’s Second Law?
• You can also rearrange the law to say a=F/m.
Then you could calculate the acceleration of
an object.
What is Newton’s Second Law?
• The total force is the sum of all the forces
acting on an object. When those forces are
balanced, the total force is zero and the object
has zero acceleration.
What is Newton’s Second Law?
• When the forces acting on an object are
unbalanced, the total force is not zero.