cacioppo science H test
if m₁ doubles and m₂ triples, f will become _________ times greater
6 (multiply the numbers)
Both contact and field forces can cause an obj to do what?
change its motion
true or false:if an object is accelerating constantly then the forces acting upon the obj are balanced
false (it is accelerating)
F=ma = F=m(Vf - Vi)/t So, F and t have an __________ relationship.
inverse
A = F/m If you triple the m, the a will becomes a third of its original value. This is called the ___________________________
inverse - multiplicative inverse or reciprocal.
BE ABLE TO ANALYZE FREE BODY DIAGRAMS FOR UNKNOWN FORCES
JUST DO IT
STUDY 11.3 QUIZ
JUST DO IT RN
KNOW ALL GRAPHS OF OBJECTS IN FREE FALL GIVEN IN CLASS
LEARN IT LIVE IT LOVE IT
Weight of an obj. DEPENDS on gravity so your weight on the moon is different from your weight on Earth. REMEMBER that your mass NEVER changes.
LEARN IT LIVE IT LOVE IT
a=net force (aka force)/mass
LEARN IT LIVE IT LOVE IT
when doing accel force mass problems, besides f=ma, f is always on top for the formula
LEARN IT LIVE IT LOVE IT
LITERALLY LIFE AS WE KNOW IT WOULD END WITHOUT FRICTION
LIKE SERIOUSLY.
B/c of friction, a _____________ must be applied to a car just to keep it moving at the same speed.
constant force
when are forces considered balanced
constant speed and no motion
Babies are placed in_______________ b/c the force that is needed to bring the baby to a stop is safely spread out over the baby's whole body.
backwards facing car seats
A truck parked on a hill does not slide b/c the friction b/w the wheels & the ground _________ the force of gravity.
balance
when a car moves at constant speed, the force moving the car forward ___________ the friction.
balances
after dropping a penny of the empire state building, it wouldn't kill someone, just mildly injure them. why?
because when you drop the penny it will accelerate until it reaches terminal velocity, then it will travel at a constant speed and stop accelerating because it has reached terminal velocity. btw don't try that because you could really hurt someone
Static friction ________ exist if there is no opposing force
cannot
free fall acceleration of an object is directed toward the _________ of the earth
center
The force of gravity __________ as the distance b/w 2 obj.s changes.
changes
if we ignore air resistance, as an object is in free fall, its velocity _________________
increases at a constant rate
projectile motion has 2 components, the other 2 components are __________________
independent of one another
You wear a seatbelt in a car to hold you in your seat in the event of a crash. What is the reason you would continue moving w/o a seatbelt when the car stopped suddenly
inertia
what is the tendency of an object at rest to remain at rest or, if moving, to continue moving at constant velocity
inertia
What type of relationship exists b/w accel and mass.
inverse
what mathematical relationship exists between gravitational force and distance
inverse squared
in the formula F=(gm₁m₂)/d², f and d have a _____________________ relationship
inversely squared
When you push forward on an obj., _static_friction acts in a backward direction & opposes the motion. So what happens to the frictional force if you stop pushing the obj.?
it stops completely because it has nothing to oppose anymore
Also equal to ___________- a car will NOT roll down a hill w/ its brake on b/c the force of friction b/w the brakes & the wheels balances the force of gravity.
no motion
on a velocity time graph what would the slops look like if there were no forces acting on it
none (wouldn't exist)
gravity __________ as the distance increases
decreases
what is the force exerted by a surface as an obj moves across it
friction
What is the net force equal to in newtons 1st law?
0
how much is 4.45N in lb
1
in the formula F=(gm₁m₂)/d², if d doubles, f becomes
1/4(square the number than change to reciprocal)
One Newton is the force that can give a mass of 1kg an acceleration of 1 m/s2
1N = 1kg x 1 m/s2
what law does terminal velocity refer to
1st law
what law is the following: falls again reaching another constant speed and lands safely.
1st law
a 25 kg obj is currently on the moon with a g of 1.6 m/s/s fine the mass on earth
25 kg (mass never changes)
immediately upon opening a parachute while sky diving is synonymous with which of newtons laws
2nd
in Newtons ____ law, the net force does not equal 0
2nd
what law is the following: He opens the parachute to slow down. More surface area = more resistance. There is a net force acting on him so he is decelerating-
2nd law
an obj has an acceleration of 8 m/s/s. the mass is increased by 2.then the new acceleration would be ???
4 (because they are inversely proportional)
how much is 1 lb in newtons
4.45 N
in the formula F=(gm₁m₂)/d², if d is reduced by 1/2 and the original force was 100N what is the new force?
400N
Near the Earth's surface, the free fall accel (gravity) is about ___________
9.8 m/s/s
free fall = g = ? (a number)
9.8 m/s²
for an object in free fall on a velocity vs time graph what is the slope and why
9.8 m/s² because the gravitational force is the net force so this force causes acceleration or deceleration due to newtons 2nd law
_________obj.s resist changes in motion, so all objs. have inertia.
ALL
______________is a form of friction, and it is the force that acts upon objects as the travel through air.
Air resistance
what does newton's 1st law say
An object at rest stays at rest and an object in motion maintains its velocity unless it experiences a net force.
If you are stopped and get hit from behind, you move____and the driver that hit you moves____.
Backward, forwards
what is the fancy formula for force (not F=ma)
F=(gm₁m₂)/d²
Every change in motion that you observe or feel is caused by ____________
Force
If accel remains constant, then the greater the mass, the greater the________ has to be.
Force
______________ affects the shapes of living things
Gravitational force
B/c weight is a force, the SI unit for weight is?
N (newtons)
what is the SI unit for force
N (newtons)
does gravity affect the horizontal component of the projectile
NO NEVER it remains constant
ALWAYS DO SIG DIGS
OKAY? OKAY.
____________________ is the strongest force. We do not feel this force on a daily basis
Strong nuclear force
_______________ is a combination of all of the forces acting on an obj. (This determines whether the velocity of the obj. will change).
The Net Force
if we ignore air resistance, as an obj falls freely, the distance traveled per second ____________
increases
____________ b/w 2 obj.s is proportional to the product of their mass.
The gravitational force
in the formula F=(gm₁m₂)/d², as the masses of the objects increase the force of attraction _________ and vice versa
increases
YALL NEVER CHOOSE ON THE TEST THAT IT IS NEWTONS 3RD OR 4TH LAW
WE HAVEN'T LEARNED 3RD LAW AND THERE IS NO 4TH LAW IDIOT
F = ma If you double the mass, you ________the F.
_double_
A light hanging from the ceiling does not move up or down b/c the force due to tension in the cord pulls the light up and balances the force of_________pulling the light down...
_gravity_
When you push forward on an obj.,____________ acts in a backward direction & opposes the motion
_static_friction
for an object in free fall on an acceleration vs time graph, what would it show
a constant acceleration of 9.8 m/s²
are objects in space ever weightless?
no
A = F/m If you triple the m, the a will become_____________of its original value.
a third
what is the formula for accel with force and mass
a= f/m
what is the correct formula for acceleration
a=f/m
An obj. ___________ in the direction of the net force.
accelerate
a falling object stops ___________ when the force of air resistance becomes equal to the gravitational force of the object (weight)
accelerating
When 2 masses are the same, a greater force provides a greater _____________
acceleration
what does the slope on a force mass chart represent
acceleration
astronauts and the vehicle in which they are traveling are falling toward earth with the same ____________
acceleration (meaning everything is accelerating at the same rate and at the same time)
Unbalanced forces equal to?
acceleration or decleration
if there is no ______________ all objects falling near the earth's surface accelerate at the same rate regardless of their mass
air resistance
what is a major reason for terminal velocity
air resistance
what is the forces that are in opposition to the relative motion of an object through the air
air resistance
what is the law of universal gravitation
all objects in the universe attract each other through the force of gravity.
when an object is very small such as a paper clip gravity is _______________________________ to detect
almost not noticable
there is __________ a gravitational force acting on every object in the universe even if it is very weak
always
astronauts in orbit experience ____________________
apparent weightlessness
what is is the force in which an object comes in contact with another object When you catch a ball and it stops moving
contact force
in the formula F=(gm₁m₂)/d², as d increases, f ___________ and vice versa
decreases
What kind of relationship exists b/w force and accel.
direct
What type of relationship b/w force and mass?
direct
How is inertia related to mass?
directly
in the formula F=(gm₁m₂)/d², what kind of relationship does force and mass have
directly proportional
The accel of an obj. is _______proportional to the net force on the obj. and __________ proportional to the obj.s mass.
directly; inversely
in the formula F=(gm₁m₂)/d², d=?
distance between the 2 objects centers
Balance forces _________ cause a change in the motion of a moving obj.
do not
balanced forces ___________ cause an obj at rest to start moving..
do not
F = ma If you double the mass, you _double_the F. Also, you can double the a to ________the F.
double
in the formula F=(gm₁m₂)/d², if only m₁ doubles, f ____________
doubles
when an object is very massive such as earth gravity is _________ to detect
easy
when do we (not in space) experience apparent weightlessness
ex. tower or terror
true or false: inertia is a force
false
true or false: kinetic friction resists the initiation of sliding motion
false
true or false: weight is the amount of matter in an obj
false
true or false: if a person is moving to the right, then the forces acting upon it are not balanced
false (not enough info. constant speed of not?)
true or false: it would take an unbalanced force to keep an object in motion
false (not enough info. constant speed or not?)
what is forces that do NOT require that the objects touch each other the two poles on a magnet
field force
Accel depends on __________ and mass.
force
in the formula F=(gm₁m₂)/d², f=?
force of attraction
what are the 4 fundamental forces
force of gravity electromagnetic force strong nuclear force weak nuclear force
astronauts in orbit are in ________________
free fall
what is the motion of a body when only the force of gravity is acting on the body
free fall
and object is controlled by 2 independent motions so an object projected horizontally will reach the ground in the same time as an object dropped vertically. no matter how large the horizontal velocity is, the downward pull of gravity is always the same
gif of this on slide 33 of 12.2
in the formula F=(gm₁m₂)/d², g=?
gravitational constant
__________ is the reason an apple falls from a tree
gravity
astronauts in space are not weightless because earth's ___________ is always acting on them and their shuttle
gravity
what keeps the plantes in orbit
gravity
vertical velocity changes due to its __________
gravity (net force acting on the object, 2nd law)
Inertia is related to mass; the larger an object's mass is, the _________ the inertia will be.
greater
The force required to make a stationary obj. start moving is (greater or less) than the force necessary to keep it moving
greater
The greater the mass, the _________ the gravitational force it exerts on other obj.s
greater
When a car accelerates, the force moving the car forward is ________ than the opposing force of friction.
greater
static friction is usually ________ than kinetic friction.
greater
the greater the surface area of the object the ____________ the air restsiatnce
greater
when 2 forces acting on an object are not equal, causing the object to move in the direction of the ___________
greater force aka net force
A = F/m If you double the m, then the a will __________
half.
What is the shape of a line on a accel mass graph graph called?
hyperbola
Friction is ___________ if the force pushing the surfaces together is increased.
increased
If F increases, then A __________ and vice versa if mass remains constant.
increases
as the speed of an object increases the air resistance ____________
increases
gravity decreases as the distance _____________
increases
gravity increases as mass _____________
increases
i believe in you
jk but keep going
the force that opposes the movement of 2 surfaces that are in contact & are moving over each other. Also, friction b/w moving surfaces.
kinetic friction
Why do astronauts bounce around on the moon?
less gravity
how would you increase helpful friction
making surfaces rougher
_________ is a measure of inertia
mass
a measure of the amount of matter in an object
mass
what does the slope on a force accel graph represent
mass
in the formula F=(gm₁m₂)/d², m₁=?
mass of object 1
in the formula F=(gm₁m₂)/d², m²=?
mass of object 2
what is the formula for force
mass x acceleration
what is the formula for weight
mg (mass times gravity)
what is the following an example of: If you slide a book across carpet, it will soon come to a stop. On a smoother surface (ice), the book will slide much farther.
newtons 1st law
what law talks about constant speed
newtons 1st law
what law talks about unbalanced speed
newtons 2nd law
are mass and weight the same?
no
are you going to fail this test?
not if you stop singing freaking drake and actually focus
Newton's 1st Law of motion is called The Law _____________-
of Inertia.
air resistance acts in an __________ direction to the weight of a falling object (gravity)
opposite
orbiting is ____________
projectile motion
gravity _____________ as distance increases
remains constant
when air resistance balances the weight of an obj that is falling, the velocity ______________
remains constant
vertical velocity changes due to its gravity and the horizontal velocity ______________
remains the same (not net force acting on the ball if air resistance is ignores, 1st law)
projectile motion has 2 components, ________ and __________
size and distance
the force that resists the initiation of sliding motion b/w 2 surfaces that are in contact & at rest. Also, friction b/w surfaces that are stationary.
static friction
what do larger animals need to support their mass a/g the force of gravity
stronger skeletons
what is the constant velocity of a falling object when the force of air resistance in equal in magnitude and opposite in direction to the force of gravity
terminal velocity
yall gotta go on your own and look at slides 27, 29, 33-36 of 12.2 because they are pictures sooooooo
thanks
slide 28 of 12.2 is hard to type so just go look at it because im lazy
thanks yall
On Earth, your weight is _________________exerted on you by the Earth.
the amt of grav. force
What happens if you push a box east and your friend pushes north?
the box moves in a northeasterly direction
in the formula F=(gm₁m₂)/d², what happens to the force if you tripple the distance
the force will decrease to 1/9its original value (square the number than change to reciprocal)
what is the law that says any 2 bodies in the universe attract each other with a force that is directly proportional to the product the their masses and inversely proportional to the square root of the distance between them
the law of universal gravitation
the amount of air resistance depends on what
the size, shape, and speed of the object
force is a vector or scalor
vector-it has direction
for an object in free fall on a distance vs time graph what does the slope equal
velocity but velocity is changing
do you want to succeed in life
then put down your dang phone and focus here
if we ignore air resistance what will hit the ground first, a bowling ball or a feather?
they will hit the ground at the same time
why do larger animals need stronger skeletons
to support their mass a/g the force of gravity
in the formula F=(gm₁m₂)/d², if m₂ triples, f _________
triples
true or false:if an object is moving to the right and slowing down then the Fnet is directed towards the left
true (it is decelerating and deceleration is to the left)
When the car you are riding in comes to a stop, your seatbelt and the friction b/w you and your seat stop your forward motion. They provide the________________ that is needed to bring you to a stop as the car stops.
unbalanced backward force
a measure of the gravitational force exerted on an obj.
weight
a measure of the gravitational force exerted on an object
weight
mass x gravity (force)=?
weight
List examples of how to reduce unwanted friction:
when cooking use non stick pans use lubricant non friction materials (like oils)
when is the force directed to the right
when it is accelerating
when is the force directed to the left
when it is decerlerating
If no net force acted on the book, would it slide forever?
yes (but this would never happen bc friction)
Would a 4-scale balance work the same on the moon?
yes because it measures mass not weight
It will NOT accel if the net force is _________________
zero or balanced
