physics final Flashcards by Charlie Provencher

what is translational motion

linear movement from one pt to another

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what is rotational motion?

rotation about some point

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can rotational motion occur by itself

yes

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what are rigid bodies

they maintain shape during motion

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where is the mass in object

centre of mass

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is rotational motion a cross or a dot product

cross

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is counter clockwise or clockwise positive?

CCW is positive

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what is the reason for rotation

torque

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what is torque

the force applied to an object some distance from the point of rotation

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how is the level of torque related to the ease of rotation

greater torque means easier rotation

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if all the force on an object rotating that is attached to the wall have the same magnitude, which on is the greatest

the one further from the hinge or the one closest to being perpendiculer to r

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how are r and torque related

the greater r the greater torque

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what is r in torque?

the moment arm, distance from wall

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what are the two formulas for torque

t= rFy
t= rFsin

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if a rotating object is in static rotational equilibrium what is torque

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planks are in what

static equilibirum

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what do you do if the plank is not massless

make the weight a mass and place it in center of mass

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what is kinetic energy

energy in movement of a mass

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what is potential energy

energy in relative positions of mass in space

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What is thermal energy

kinetic and potential that make up the mass

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what does mechanical energy mean

the work done to move an object

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what is the formula for work

Fdcos

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is work a dot or cross product

dot

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what is net work equal to

the change in kinetic energy, which is all the different works added up

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conservative force

same work done regardless of the path, associated with potential energies

non conservative force

the work done is dependant on the path, not associated with potential energy

what is the formula for non conservative work

Wnc= change in kinetic + change in potential

what us the formula for change in potential energy

mgh2- mgh1

what is the formula for conservatice force

negative change in potential

if an object moves down a road with fritction and it starts with 10j of potential energy will it end with 10j of kinetic energy

less than 10, some lost to friction

when do you use conservative force

if there is no friction or drag

what is the formula for spring force

-kx

what is the formula for spring potential energy

kx^2/ 2

what is the spring potential energy

the energy in the compression or extension of a spring

whats the formula for power

what is dcos often equal to in work problems

change in y

whats the formula for change in kinetic energy

mv^2/2

what happens in a graph when it is stable

it oscilated

what happens in a graph when its unstable

it accelerated away from unstable position

where in a graph would it be stable or unstable

stable at mins unstable at maxs

what is the tension in a chain

same everywhere

where does acceleration point in circular motion

the centre

is centripetal acceleration a forc?

no it is the net force

what is the formula for centripetal acceleration

v^2/2 or w^2r

what happens to r and t axes in circular motion

they are alwasy changin byt stay radial and tangential to circular path

what is the formula for orbital velocity

square root of GMe /r

what does it mean for something to be in orbit

if you were to hit a ball and it stays in free fall

is newtons law valid in intertial or non inertial reference frames

its valid in inertial reference frame

what is inertial reference frame

when an object stays in its natural state until acted on by a force ex when a bus accelerates a ball on the bus would roll to the back

in reaction pairs is the magnitude and direction the same and what about acceleration

maginutdes are equal but directions are different and the heavier object will have more acceleration

what is drag force

resistance through fluids

what is a cross sectional area

the area of an object facing a fluid in drag

whats the formula for draag

i/2cpav^2

what does terminal speed mean

a=0

as velocity increases what happens to drag

it increases

what happens when drag is equal to gravity

a=0

whats the formula for gravitational force

GMm/r^2

whats the formula for gravitational acceleration

GM/r^2

formula for static and kinetic friction

uN`

for an object with static friction to move what has to happen to the applied force

it must be larger than the max static friction

is accleration proportional to force

yes

if F is constant how is acceleration in relation to mass

inversly proportional

what is newtons third law

when one body exerts a force on a second body it will be an equal and opposite reaction

how many object does newtons third law need

is static friction or kinetic friction bigger

static

whats the difference between static and dynamic equilibrium

static- no movement dynamic- constant velocity

what is change in direction in circular motion

tangential velocity

what is angular velocity

w= change in angle over change in time (rad/s)

how do you turn degrees to radisu

degree times pi over 180

formula for tangential velocity

v=rw

what does centripetal acceleration dp

keep objects moving in a circle

angular acceleration is what to centripetal acceleration and tangential accelecration

perpendicularr

is force a vector or scalar

vector

do forces have to be in contact to occur

what is the force for apparent weight

normal force

when does spring force increase

the greater the compression or stretch from unstretched positon

whats the formula for spring force

-kx

whats the formula for acceleration to due gravity

a= GM/r^2

what do you do for vector addition

tail to tip

to have subtraction in vectors what do you do

multiply one vectore by -1 to switch the direction

how do you find the magnitude of a force

square root of x^2 plus y^2

what are unit vectors

vectors in terms of scalars

how do you find the dot product

multiply the i's together and the j's together then add them

is the result of a dot product scalar or vector

scalar

is the result of a cross product a scalar or a vector

vectore

right hand rule

point fingers towards a then curl towards b

how do you find the cross product using unit vectors

multply the i's and j's together then subtratc them

formula for acceleration

change in velocity over time

in a position vs time graph what does the slope represent

velocoty

in a velocity vs time graph what does the slope represent and what is the area underneath

slope is acceleration, area is displacement