Learning Center
Plans & pricing Sign in
Sign Out

3 Laws Of Motion


									                    According to Newton's first law...

        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".

                       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?

This law is the same reason why you should always wear your seatbelt.

                      Now that you understand
                    Newton's First Law of Motion,
              let's go on to his Second Law of Motion.
            According to Newton's second law...

     Acceleration is produced when a force acts on a
     mass. The greater the mass (of the object being
      accelerated) the greater the amount of force
            needed (to accelerate the object).

               What does this mean?

  Everyone unconsiously knows the
 Second Law. Everyone knows that
heavier objects require more force
    to move the same distance as lighter objects.
    However, the Second Law gives us an exact
relationship between force, mass, and acceleration.
 It can be expressed as a mathematical equation:


 This is an example of how Newton's Second Law
 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.

           Answer = 50 newtons

           This is easy, let's go on to
          Newton's Third Law of Motion
            According to Newton's third law...

    For every action there is an equal and opposite

              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.

  You have just learned about
Newton's Three Laws of Motion.
         Home || Quiz

To top