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Physics
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Pre-Comp Prep
Terms in this set (84)
The SI unit for measuring height or distance is __________
meter or m
The derived SI unit for acceleration is __________
meter/second^2 or m/s^2
The SI unit for measuring area is __________
meter^2 or m^2
The SI units for Newton is __________
kg·(m/s^2)
5 g = _______ kg
0.005 kg
The Net Force formula is ____________
...
____________ is the force that opposes motion of an object
friction
____________ is the force that is a measure of gravity acting on an object
weight
If forces on an object are balanced, then the Net Force = ______
0 N
average velocity formula
...
average acceleration formula
(final velocity-starting velocity)/time it takes to change velocity
velocity definition:
velocity is speed with ____________
direction
acceleration definition:
acceleration is rate of change in ____________
velocity
The SI unit for temperature is __________
Kelvin or K
What is measured in meter/second or m/s?
speed AND velocity
The SI unit for time is __________
seconds or s
The SI unit for mass is __________
kilogram or kg
To show that an object is moving, we use a ________________ point
reference
1/100 has the __________ prefix
centi
The variable "t" represents __________
time
The variable "x" represents __________
location or position
Newton's 3rd Law of Motion says for every action force, there is always a second EQUAL and OPPOSITE __________ force
reaction
action-reaction pairs
Newton's 1st Law of Motion says an object in motion will __________ _____ ___________ with same speed and ___________ unless acted upon by ____________________ force
1) stay in motion
2) direction (think velocity)
3) unbalanced
The "Law of Inertia" is Newton's __________ Law of Motion
1st
inertia is the __________________ of an object to any change in velocity
resistance
Newton's 1st Law of Motion says an object at rest will __________ _____ ___________
stay at rest
inertia is related to the __________ of an object
mass
an object with more mass has __________ inertia compared to an object with less mass
more
The SI unit for volume is ________
meter^3 or m^3 (for solids)
liter or l (for liquids)
all moving objects have ____________________
momentum
greater speed = more momentum
momentum makes it difficult to __________ an object
stop
In the scientific method, hypothesis comes after ____________________
question
____________________ is the first step in the scientific method
observation
Law of Conservation of Energy
the law that states that energy cannot be created or destroyed but can be changed from one form to another
A ____________________ is an educated guess on an outcome and the 3rd step of the scientific method
hypothesis
The acceleration of gravity on earth is __________
...
Scientific rules or __________ help us understand how the universe works (think Newton's __________ )
laws
The SI unit for density is __________ (mass/volume)
kg/m^3
The SI unit for electrical current is __________
ampere or A
An agreement by qualified observers gives a scientific __________
fact
Power definition: Power is the __________ of energy transfer or work being done
rate
Work definition:
Work is the __________ of energy to an object
transfer
The energy of an object based on its HEIGHT is __________ __________
potential energy
more height = more potential energy
Kinetic energy is the energy of an object based on its __________
speed
greater speed = more kinetic energy
The SI unit for (ALL TYPES) of energy is __________
Joules or J
Work formula: Work = Force * __________
distance
W (in Joules) = F (in Newtons) * d (in meters)
W = Fd
For Work, the push or pull must be in the __________ direction as the motion AND the object must __________
1) same
2) move
There is NO work if the push or pull and motion (velocity) are _________________ or if velocity is __________
1) perpendicular
2) zero (not moving)
Power formula: Power = __________ / time
Work
Power (Watts) = Work (Joules) / time (seconds)
P = W/t
To increase power, someone must do __________ work in the same amount of time
more
To increase power, someone can also do same amount of work in __________ time
less
Momentum formula: p = mass * __________
velocity
p (in kg
m/s) = mass (kg)
velocity (m/s)
p = mv
Momentum is a __________
vector
uses velocity so direction matters!
velocity direction = momentum direction
collision = when two __________ objects run into each other
moving
in a collision, the object with __________ momentum wins
greater
the Law of Conservation of Momentum says momentum can't be __________ or __________ only transferred between objects in a system
created or destroyed
in a closed system, the total momentum is __________
constant
scientific method = a set of steps to investigate a scientific __________
question
Collisions can be __________ or __________
1) elastic
2) inelastic
A hypothesis must be __________
testable (through experiments)
Weight is the measure of __________ acting on an object
gravity
Gravity definition: The force of __________ between two objects due to their __________
1) attraction
2) mass
Weight is dependent on the mass of the __________ and of the second object
planet
__________ measures the amount of matter in something
mass
Law of universal gravitation says the force of attraction between two things depends on their __________ and __________
1) masses
2) distance
Force of gravity or weight = mass * __________
gravity
Fg (Newton) = mass (kg) * gravity (m/s^2)
Fg = mg
the gravity on Earth is __________ m/s^2
9.8 m/s^2
mass is __________ everywhere
constant
__________ is the force that opposes motion when two surfaces are touching
friction
Two surfaces moving against each other creates __________ friction
kinetic
when a force is applied to a non-moving object, there is __________ friction
static
Walking uses __________ friction
static
If your feet slip on the floor, there is __________ friction
kinetic
Name one way to reduce friction
switch from sliding to rolling
Friction is __________ the direction of motion
opposite
example:
moving left, friction right
Friction is __________ to the surface
parallel
Name one way to increase friction
switch from rolling to sliding
Do the two forces (action-reaction pair) in Newton's 3rd Law cancel each other out?
No because they act on different objects
Newton's 3rd Law always has two __________ and __________
objects and forces
On earth, __________ and __________ usually stop moving objects
gravity and friction
Newton's 2nd Law of Motion says the acceleration of an object is __________ proportional to the force applied and __________ proportional to the object mass
1) directly (force)
2) indirectly (mass)
a = F/m
Newton's 2nd Law formula can be written in __________ ways
3 ways
a = F/m
F = ma
m = F/a
acceleration is determined by object mass and ________ ____________ (think Newton 2nd law)
net force
1/10 has the __________ prefix
deci
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Verified questions
physics
A man attaches a divider to an outdoor faucet so that water flows through a single pipe of radius 9.00 mm into two pipes, each with a radius of 6.00 mm. If water flows through the single pipe at 1.25 m/s, calculate the speed of the water in the narrower pipes.
physics
It is often said that “friction always opposes motion.” Give at least one example in which (a) static friction causes motion, and (b) kinetic friction causes motion.
physics
Repeat previous problem for motion in three dimensions.
physics
A cup of coffee is on a table in an airplane flying at a constant altitude and a constant velocity . The coefficient of static friction between the cup and the table is 0.30. Suddenly, the plane accelerates forward, its altitude remaining constant. What is the maximum acceleration that the plane can have without the cup sliding backward on the table?
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