Download Newton`s First Law- Every object remains at rest or moves at a

Newton’s Laws!!!
Sir Isaac Newton
Sir Isaac Newton – English physicist and
mathematician
Book Published
Mathematical Principles in Natural
History
Laws of Motion- explanation of
movement of all objects in the universe
Vocabulary
Net Force- sum of all forces acting on an object
Mass- the amount of matter in an object
Speed- the distance traveled in an amount of time
Velocity- object’s speed and direction at an instant
Acceleration- is the change in object’s velocity over time
Force- Measured in N (Newton’s)
Newton’s First Law (Inertia)
Newton’s First Law - Every object
remains at rest or moves at a
constant speed in a straight line
unless acted upon by an outside
force.
Newton’s Cradle
Newton’s First Law (Inertia)
Law of Inertia- the resistance to any change in
motion.
• The amount of inertia of any object depends on
the mass
• If the net force is greater than 0, there will be
movement in the object.
• If the net force is 0…..
–The object will stay at rest.
Newton’s Second Law
Newton’s Second Law- The acceleration of an object by a
force is inversely proportional to the mass of the object
and directly proportional to the force.
What?
Part 1-Smaller mass greater acceleration with same force
ex. Marble vs. Bowling Ball –Which rolls first?
Part 2-The greater the force applied the greater the acceleration if the
mass is the same.
ex. Two bowling balls—Baby pushes/ Adult pushes
Newton’s Second Law
Force= mass X acceleration
– F=mXa
– M=f/a
– A=f/m
Newton’s Second Law explains why two objects hit at the
same time. (Compare the two below.)
Ex. Marble F=.49 N m=.05 kg
Ex. Bowling Ball F=68.6 m=7.0 kg
Terminal speed- the greatest speed an object can reach
while falling through the air
Newton’s Third Law
Newton’s Third Law- For Every
action there is an equal and
opposite reaction.
Ex. rocket
WORK!!
Work-force applied to an object and the distance
moved
– Work is measured in joules
Work= force x distance
Example- You push a box with the force of 30N
two meters.
30N x
2
= 60 joules
force
distance
Example-You push but do not move a box of with
the force of 10N.
10N x 0 =
0 joules
force
distance