Newton's 1st Law of Motion
Terms in this set (15)
Law 1: Inertia?
Objects at rest remain at rest, objects in motion remain in motion unless acted upon by an unbalanced force.
What is Inertia?
Inertia is a property of matter, by which a mass resists changes to it's motion
What does Inertia depend upon?
ONLY ON MASS!
What does inertia NOT dependent upon?
Examples of Inertia...
~Why you should wear a seat belt
~Why you shouldn't stand on a bus while it's moving
~Why a child "fall backs" when you yank their wagon forward
Which cart has the greatest inertia?
1. a 1-kg cart traveling at 4 m/s
2. a 2-kg cart traveling at 3 m/s
3. a 3-kg cart traveling at 2 m/s
4. a 4-kg cart traveling at 1 m/s
Inertia does not depend on speed, only mass
A push or a pull applied to an object (is a vector)
Free Body Diagram
Table ^ (Normal Force)(Fn)
Tension force of a rope -> (Ftension)
Force of gravity -> (Weight)(Fg)
What is Net Force?
Vector sum of all forces. The "overall" affect of all forces acting on an object.
Determining the Net Force?
If the forces act in the same direction: Add them to find the net force
If the forces act in opposite directions: Subtract to find the resultant
Don't forget to show direction of the net force!
Balanced forces? (Equilibrium)
Objects may either be
1.) At rest
2.) Having constant velocity
Mass vs. Weight
Mass: The amount of matter something is made of. Related to inertia, units: kg
Weight: The force of gravity acting on an object's mass. g=fg/m
g=Gravitational field strength
Fg=Force of gravity (weight)
m=Mass of kg
What is friction?
When does friction happen?
A contact force between 2 surfaces that resist lateral motion
Surfaces have to be in contact, and a force applied to one of the objects is trying to slide that object
Does friction change once an object starts sliding?
Static friction is greater than sliding (kinetic) friction
Normal force (Fn)
Normal force is a reaction force applied by a surface to an object resting on that surface
On a flat (horizontal) surface, normal force will be equal to weight.
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