Newton�s Laws of Motion - Download Now PowerPoint

							• Sir Isaac Newton was one of the
  greatest scientists and
  mathematicians that ever lived.
• He was born in England on
  December 25, 1643. He was
  born the same year that Galileo
  died.
• Newton attended Trinity College
  Cambridge where he became
  interested in math, physics, and
  astronomy.
• Newton had new ideas about
  motion, which he called his three
  laws of motion.
An object at rest will remain at rest
    unless acted on by an unbalanced
  force. An object in motion continues
 in motion with the same speed and in
 the same direction unless acted upon
   by an unbalanced force. This law is
               often called
           "the law of inertia".
  Inertia: the tendency of all objects to
  resist any change in motion.
            Let’s break it down
An object at rest will remain at rest
  unless acted on by an unbalanced
                force.

     What does at rest mean?
             Let’s break it down
An object in motion continues in motion
 with the same speed and in the same
   direction unless acted upon by an
           unbalanced force.

    Why do objects set in motion stop?
   What does this mean?
This means that there is a natural
tendency of objects to keep on doing
what they're doing. All objects resist
changes in their state of motion. In
the absence of an unbalanced force,
an object in motion will maintain this
state of motion.
Let's study the "skater" to understand
this a little better.




      What is the motion in this picture?
 What is the unbalanced force in this picture?
    What happened to the skater in this
                 picture?
       Is there evidence of inertia?
 This law is the same reason why you
 should always wear your seatbelt.




     What is the motion in this picture?
What is the unbalanced force in this picture?

What happened to the driver in this picture?
       Is there evidence of inertia?
         Inertia and Mass
   Objects will smaller mass have less
   inertia (or the tendency to resist
   change) than objects with more mass.




Inertia makes it harder to push a bus than a
bike and easier to stop a bike than a bus
moving at the same speed.
More Examples of Newton’s
       First Law…
                           Four-Square
         Definition                                  Picture
An object at rest will remain
at rest unless acted on by an
unbalanced force. An object in
motion continues in motion with
the same speed and in the
same direction unless acted
upon by an unbalanced force.

           Example            Inertia          Other Information

                                        Inertia is the tendency of
                                        objects to resist a change in
                                        motion.
The acceleration of an
object depends on the
mass of the object and
 the amount of force
       applied.
                   Let’s break it down

          Acceleration of an object
           depends on the mass of
                 the object.
If the force
applied is the
same, the
acceleration of
the empty cart
is greater than
the acceleration
of the full
cart.
       Let’s break it down

Acceleration of an object
depends on the amount of
     force applied.
  What does this mean?
Everyone unconsciously knows
  the Second Law. Everyone
 knows that heavier objects
 require more force to move
the same distance as lighter
          objects.
 Let's study the animations to
understand this a little better.
  The Second Law gives us an exact
relationship between force, mass, and
acceleration. It can be expressed as a
        mathematical equation:


               or
FORCE = MASS times ACCELERATION
           This is an example of how
          Newton's Second Law works:




Mike's car, which weighs 1,000 kg, is out of gas. Mike is trying
to push the car to a gas station, and he makes the car go 0.05
m/s/s. Using Newton's Second Law, you can compute how much
force Mike is applying to the car.
              Remember



                      Answer: 50 Newtons
   Let’s try another one…
      ____ N ?
                 1,000 Kg   .1 m/s/s




Our formula would be:



            Answer: 100 Newtons
           Quiz Time
        If the same amount of
        force is applied, which
        vehicle will accelerate
            faster? Why?



Suzie
        If Suzie uses 50 Newtons      Billy
        of force to begin biking
        and Billy uses 35 Newtons
        of force to begin biking
        who will accelerate faster?
                    Four-Square
       Definition                            Picture

The acceleration of an
object depends on the
mass of the object and
the amount of force
applied.
                         Second
        Example           Law           Other Information

                                  The Second Law can be
                                  expressed as a
                                  mathematical equation:
                                  Force = mass x
                                  acceleration
                                  or F = M x A
  For every action
there is an equal and
 opposite re-action.
          What does this mean?

    This means that for every force there is a
reaction force that is equal in size, but opposite in
 direction. That is to say that whenever an object
 pushes another object it gets pushed back in the
           opposite direction equally hard.
Let's study how a rocket works to understand
            Newton's Third Law.




 The rocket's action is to push down on the ground
 with the force of its powerful engines, and the
 reaction is that the ground pushes the rocket
 upwards with an equal force.
 UP,
 UP,
 and
AWAY!
The shuttle’s
thrusters push the
                     More examples…
exhaust gases
downward as the                     The rabbit’s
gases push the                      legs exert a
shuttle upward                      force on Earth.
with an equal                       Earth exerts an
force.                              equal force on
                                    the rabbit’s
                                    legs, causing
                                    the rabbit to
                                    accelerate
                                    upward.
           The bat exerts a force on the
           ball, sending the ball into the
           outfield. The ball exerts an equal
           force on the bat, but the bat
           does not fly toward the catcher
           because the batter is exerting
           another force on the bat.
                          Four-Square
       Definition                                 Picture

For every action
there is an equal and
opposite re-action.


                                Third
        Example                              Other Information
                                 Law
       The rabbit’s legs                Whenever an object
       exert a force on
       Earth. Earth exerts              pushes another object
       an equal force on the            it gets pushed back in
       rabbit’s legs, causing
       the rabbit to                    the opposite direction
       accelerate upward.               equally hard.
1. Who was the scientist who gave us the Laws of Motion?

2. How many Laws of Motion are there?

3. What is another name for the first law of motion?

4. Which law explains why we need to wear seatbelts?

5. Which law says that force is equal to mass times acceleration (F=MA)?

6. Which law says that heavier objects require more force than lighter objects
to move or accelerate them?

7. Which law explains how rockets are launched into space?

8. Which law says that for every action there is an equal and opposite
reaction?
1. Who was the scientist who gave us the Laws of Motion?
Answer: Sir Isaac Newton

2. How many Laws of Motion are there?
Answer: three

3. What is another name for the first law of motion?
Answer: Law of Inertia

4. Which law explains why we need to wear seat belts?
Answer: First Law of Motion

5. Which law says that force is equal to mass times acceleration (F=MA)?
Answer: Second Law of Motion

6. Which law says that heavier objects require more force than lighter objects to
move or accelerate them?
Answer: Second Law of Motion

7. Which law explains how rockets are launched into space?
Answer: Third Law of Motion

8. Which law says that for every action there is an equal and opposite reaction?
Answer: Third Law of Motion
     Works Cited
 Much of the information,
  graphics, and animation
 were gathered from the
     following website:
http://teachertech.rice.ed
u/Participants/louviere/Ne
            wton/