Measurement and equilibrium and sig figs

equation from mass to weight

fg=m\*g

is mass vector or scalar

scalar

is weight vector or scalar

vector

is weight intrinsic or extrinsic

extrinsic

is mass intrinsic or extrinsic

intrinsic

what is weight

the force of gravity on an object and always acts down (toward center of the earth)

what was mass measured in

kilograms

mass doesn’t change

based on location

A measure of the amount of ___ in an object

matter

Inertia

The more mass an object has, the more of a tendency it has to maintain its current state of motion.

newtons first law

Objects in motion stay in motion unless acted upon and an object in motion will remain in motion unless acted upon by an outside force.

acceleration due to gravity

9\.81 m/s^2

rules for sig figs

every nonzero digit in number, zeros are significant=if its the last digit in the measurement and comes after decimal, or the zero has sig figs on either side of it

what are significant digits

the way we measure a measurements precision. the more sig figs a number has the more precise

all objects in equilibrium have net force of

zero

dynamic equilibrium

moving in straight line with constant speed

static equilibrium

at rest not moving

equilibrium

motion that is unchanged

is force a vector or scalar

vector

what is a scalar

a number that has magnitude

what is a vector

a quantity that has direction and magnitude

what is net force

the total sum of force acting on an object

what symbol do we use for mass

m

what is mass

how much matter in an object and the meausure of an obects inertia

What is the net force of 3.0N & 4.0N to the right?

5n to the right

(net force is constant) as mass increases acceleration

decreases

(mass is constant) As net force increases acceleration

increases

Objects in equilibrium don’t

change their motion, don’t accelerate

what is acceleration measured in

ms^2

is acceleration a vector or scalar

vector

linear motion

motion in a straight line

velocity

how far you are from where you started

what is velocity meausured in

measured in meters per second

is velocity a vector or scalar

vector

symbol for weight

fg

symbol for net force

EF

unit for weight

newton

What is acceleration?

rate of change in velocity over time

symbol for acceleration

a

as mass increases the acceleration…..

decreases

as net force increase acceleration ….

increases

applied force

the force of a person/object pushing on another object

symbol for applied force

fa

force

push or pull on an object by another object

tension

a pulling force that results when a string is stretched, always along direction of tension

friction

cause by two materials rubbing together always acts opposite motion: acts against the direction of motion

symbol for friction

f

tension unit

n

symbol for tension

t

is normal force a vector or scalar

normal force unit

n

symbol for normal force

fn

normal force

always perpendicular to surface (fn) pushing force that results from a surface being compressed

instantaneous velocity

velocity at specific time

equation for slope (r)

rise over run

equation for slope (y2)

y2 -y1/ x2-x1

unit for mass

kg or kilograms

formula for acceleration

vf-vi/displacement=a or a=displacement/t

newtons third law

the law of action and reaction

what does newtons third law mean

any action will have an equal and opposite reaction

action and reaction are both

forces

action and reaction are not

motions

how to find the reaction of an action force

flip-flop the subject and direct object and reverse the direction.

action forces and reaction forces NEVER

act on the same object

Just because two forces are equal and opposite does not make them

an action/reaction pair.

action and reaction forces are always

equal

momentum

inertia in motion, the product of an object's mass and velocity

inertia

change in momentum

the more momentum an object has

the harder it is to stop it

magnitude

amount

all objects in free fall have the same what

acceleration

free fall

when an object is acted upon by only gravity (and no other forces) 

projectile

object in free fall

what are all forces measured in

newtons

speed

the rate at which an object covers distance

what is speed measured in

meters per second

is speed a scalar or vector

scalar

static friction

the friction force between two solid surfaces not moving relative to one another

kinetic friction

the friction force between two solid surfaces sliding against each other

fluid friction

the friction force between an object and the surrounding fluid

what does air resistance depend on

speed, area, and density

air resistance is what type of friction

fluid

air resistance

the force of friction between an object and the air it's moving through

how does air resitance act

opposite the direction of motion

work

a transfer of energy; a scalar; measured in joules

what is work measured in

joules

kinetic energy

the energy of motion

is kinetic energy a scalar or vector

scalar

what is kinetic energy measured in

joules

gravitational potential energy

the energy an object has due to its height; a scalar; measured in joules

is gravitational potentional energy a scalar or vector

scalar

what is gravitanitonal potential energy measured in

joules

is potential energy a scalar or vector

scalar

what is potential energy

energy stored in an object due to it’s position or condition

net force unit

newtons

what is potential energy measured in

joules

inversely proportional

as one quanity increases the other decreases

directly proportional

as one quantity increases the other increases

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Newton's Second Law

Net force causes acceleration. The acceleration is directly proportional to the net force, inversely proportional to the object's mass, and in the direction of the net force.