Download Newton`s Laws of Motion

Newton’s Laws of Motion
September 2016
Newton’s First Law of Motion
“The velocity of an object will remain constant unless a
net force acts on it.”
Also called the Law of Inertia
Newton’s First Law (Law of Inertia)
An object in motion will stay in motion unless a net force
acts on it.
If an object is at rest, it will stay at rest unless a net force
acts on it.
What is inertia?
 It is the tendency of the motion of an object to remain doing
what it is already doing.
 http://www.teachertube.com/video/newtons-law-1-oninertia-21642
 The amount of inertia that an object has is dependent on the
object’s mass. The more mass an object has the more inertia it
has.
If an object has a large amount of Inertia
due to larger mass:
It will be hard to slow down or speed up if it is moving
It will be hard to make it start moving if it is at rest
It will be hard to make it change direction
Examples of the effects of inertia:
Inertia causes a passenger in a car to continue to move
forward even though the car stops
This is the reason that seat belts are so important for the
safety of passengers
Inertia is the reason that it is impossible for vehicles to stop
instantaneously
https://youtu.be/d6UF-m3ODrA
Examples of the affects of Inertia:
Inertia is the reason that it is harder to start pushing a
wheelbarrow full of bricks than to start pushing an empty
wheelbarrow. More mass = more inertia
Inertia is also the reason that it is harder to stop a loaded
truck going 55 miles per hour than to stop a car going 55
miles per hour. The truck has more mass resisting the
change of its motion and therefore, more inertia.
https://youtu.be/MQAM-JieJLw