Laws of Motion –
In physics, a force is defined as something that changes an
object’s state of motion. If you push something, or pull something, you are
exerting a force on it. Forces are found all over.
Newton's First Law of Motion –
Newton's First Law of Motion is also called the Law of Inertia. Inertia means
resistance to change in motion. It says that an object that is in motion will
stay in motion, moving in the same direction and at the same speed, until
some unbalanced force acts upon it. Similarly, an object that is at rest
(not moving) tends to stay at rest, until some unbalanced force acts upon
it to make it move.
Newton's Second Law of Motion –
What this means is that objects of greater mass require greater force in
order to accelerate. If you apply a force to two different objects with
different masses, the force applied to the object with
the smaller mass will be more noticeable than the
same force applied to the larger object.
Newton's Third Law of Motion –
His Second Law of Motion adds that the force acting
on an object is equal to the mass of that object times its acceleration.
Newton’s Third Law of Motion builds upon these first two, adding that for
every action, there is an equal and opposite reaction.
Newton's Place in Scientific History –
Newton was influenced by both Galileo Galilei and Copernicus. Galileo
was the first to prove that regardless of their mass, all objects fall at the
same rate of acceleration, a turning point in science which played a key
role in Newton's later "discovery of the force of gravity.
Forces and Motion –
In physics, a force is an interaction with an object that will change that
object’s motion as long as it is unopposed. A force has both magnitude
and direction. The work of Galileo and Newton changed our
understanding of how forces work.
Newton's Laws of Motion and Rockets –
A rocket needs an enormous amount of thrust
to overcome the force of gravity. Gravity is the force that keeps things on
the surface of the Earth, rather than floating around like objects do in
space. All objects have gravity, but because the Earth has so much mass,
the influence of its tremendous gravity reaches all the way into space.
Take the example of riding in a car. The car is moving. But though you are
sitting still in your seat in the car, you are moving too, at the same speed
as the car. So, say both you and the car are moving forward at 65 miles
per hour. When you are wearing your seatbelt, you are physically bound
to the car.
Questions: Transportation –
Explain the difference in your relationship to a moving car you are riding in
with regards to whether or not you are wearing your seatbelt.
Inertia from Aristotle to Newton –
All objects have inertia, but some resist change more than others. Objects
with a larger mass tend to have more inertia. Objects with a lesser mass
tend to have less inertia.
Isaac Newton –
Isaac Newton was a famous scientist who lived in the seventeenth
century. Though he contributed many things to our scientific
understanding of the world, such as the theory of gravity, the laws of
motion, calculus and the reflecting telescope, his greatest contribution to
science was not any one discovery, but the way that he built upon the
work or previous scientists, integrating and organizing existing scientific