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Forces: Julissa Gonzalez Montillo, As mass increases, then force will…
Forces:
Julissa Gonzalez Montillo
Force
: push or pull
Pull
: a force that moves an object towards something
Tension
: a pulling force transmitted by a rope, string, chain, etc.
Push
: a force that moves an object away from something
How is force calculated?
F=ma
m: mass
Mass
: amount of stuff an object has. which is a value of inertia.
Weight is different than mass.
weight is based on where you are in the universe.
Inertia
: the concept of big things is more resistant to changes in velocity and little things aren't.
ex: a person tries pushing a train. even if the person's velocity is big, they won't be able to move the train because it has more mass.
as mass increases, resistance increases
https://youtu.be/rFdbY_V7vIo
a: acceleration
Acceleration:
a value that describes something speeding up or speeding down.
acceleration depends on the forces' magnitude. The direction in which an object goes depends on the direction of the force
External force
: a single force that acts on an object as a result of the interaction between the object and its environment
Net external force:
all of those external forces summed up
FBD
: free body diagram is a simple drawing that helps us understand what forces are being acted upon the object.
Newton's laws of motion
!st law
: An object at rest stays at rest until acted upon by a net external force.
An object in motion stays in motion until acted upon by a net external force
2nd law
: F=ma
3rd law
: For every action, there is an equal and opposite reaction.
Example: There is an asteroid moving through space at a constant speed. It comes across a child. When these two interact,
the force of the asteroid on the child is equal to the force of the child to the asteroid
.
Action and Reaction
Action
ex: a swimmer swimming forward pushes the swimmer against the water. (action force)
Reaction
ex: the water pushes back on the swimmer (reaction force) and pushes her forward
reaction force occurs at the same time as the action force.
F(1,2)= F(2,1)
Velocity and Speed
Velocity
: the speed and
DIRECTION
Speed
: how fast an object is moving. just magnitude
https://youtu.be/X4Wxd4m-QVc
Scalar vs Vector
Scalar: a value with a unit
ex: 5 meters
ex: 10 liters
scalar consists of distance, speed, time, and temperature
Vector: a value with a unit and direction
ex: 29 mph NORTHEAST
ex: 5 meters NORTH
Vector Direction
Positive: up, to the right,in, clockwise, (x,y)
Negative: down, left, out, counterclockwise, (-x,-y)
Vectors consist of displacement, velocity, acceleration, force and momentum
Displacement
: objects overall change in position.
Position
: where someone or something has been put
As mass increases, then force will increase
http://www.physics4kids.com/files/motion_laws.html
https://youtu.be/Ickovseetmk?t=30
https://clarkscience8.weebly.com/action--reaction.html
