Midterm for Physics chapter 1-3
average speed
the distance traveled divided by the elapsed time
a study of temperature and heat
thermodynamics
second (s)
time
average and instantaneous speed
what are the two types of speed
negative acceleration going up negative acceleration at the top negative acceleration going down
what describes the motion of an object thrown straight up in the air
pound
what is not a metric unit
kilo
what prefix is used for 135000
hence
what unit is used for acceralation
distance
what units does displacement have
velocity has direction speed does not
whats the difference between speed and velocity
Vector
when direction matters the quantity is a
decreases
when directions of velocity and acceleration are opposite the magnitude of the objects velocity
increases in magnitude or speed increases
when directions of velocity and acceleration are the same the objects velocity
velocity
when looking at a displacement versus time, what does the slope represent
direction
where something is heading
1 meter
100cm = how many meters?
2020g
2.02kg=
.484kg
484g=
88 ft/s
60mph is equal to how many ft/s
.61m
61cm=
v=111ft/s d-189ft
A stone is thrown downward with an initial speed of 15 ft/s from the top of Fall Creek Falls toward the pool 256 ft below. Find the speed at 3 s after being thrown and the distance traveled in 3 s.
19.6m
A walnut falls from a limb 24 m from the ground. How far does it fall in 2 seconds? How fast is it going at 2 seconds?
careful observation, formulation of empirical laws, making an hypothesis, experimental testing of hypothesis
Give the steps of the scientific method
straight line
If the acceleration is constant the velocity graph will be a
positive
If we choose to the right to be positive an object moving left and slowing down has an acceleration that is
20 m
In order to find the depth of a well, you drop a stone into it and time its fall. It hits the water after falling for 2 s. The depth of the well is about
Kelvin (K)
Temperature
acceleration
an object falling near Earth shows constanst_____ if friction is insignificant
62
suppose you throw a ball vertically up with a speed of 49m/s. neglecting air friction. what would the height of the ball in 1.5 sec later be
34
suppose you throw a ball vertically up with a speed of 49m/s. neglecting air friction. what would the speed of the ball in 1.5 sec later be
magnitude
tells us how long something is ex. 15m
Gravity
9.80 m/s2 or 32 ft/s2
2 sec
A 10 kg object dropped from a certain window strikes the ground in 2 sec. Neglecting air resistance, a 5 kg object dropped from the same window strikes ground in
4 m/s2
A a car moving to the right at 30m/s increases to 50 m/s in 5.00 seconds. The cars acceleration is
equal to -9.8m/s
A ball dropped in the absence of air resistance accelerates downward at -9.8m/s2. Instead you throw the ball upward the accelerates after its release is
-43 m/s
A ball is thrown straight up from a bridge at a speed of 11m/s. If it takes 5.5 sec to hit water what is the velocity just before it hits the water
8.6m/s down
A ball is thrown straight up from a bridge at the speed of 11m/s what will its velocity (speed and direction) after 2 sec
The accerelation on the ball is always -9.8m/s2
A ball thrown straight up. It reaches its highest point and then falls back.
5.5m/s2
A car accelerates from 0 to 33 m/s in 6 secs. What is the magnitude for the accelerations.
-4.2
A car is traveling at 22m/s and slows to 5.3m/s in 4 sec what is the acceleration
77.5m
A car is traveling at 33m/s when the driver uses the brakes to slow down to 29 m/s in 2.5 sec. How many meters will it travel during that time
28.69
A car moving at 22m/s acceralates at 3 m/s2 for 2.23sec. what will the final speed be in m/s
5.6hr
A car travel at 75km/hrs how long will it take to travel 420km
65.08
A car traveling at 22m/s accerates for 2.45 sec at at a rate of 2.25m/s2. How far will it travel in meters during this time
225km
A car travels at 75 km/hr for 3.00 hrs. How many km will it travel
35m/s and 138m
A car, moving at 20 m/s, accelerates for 5.00 s at a rate of 3.00 m/s2 . What are the new velocity and the distance traveled?
V=5.2m/s V=-24.4m/s
A child throws a golf ball upward from the top of a building. The ball leaves the child's hand at a height of 20 m above the ground traveling upward with a speed of 15 m/s. Find the velocity at 1 s and at 4 s and the height at 1 s and at 4 s.
59
A rock dropped from a bridge takes 3.47 to hit the water. How high is the bridge in meters?
0m/s
A runner can run a 400 meter lap in 50 sec. He finishes at the same spot he began. What is his average velocity?
4.7
A runner travels 1.55km in 5 min and 30 sec. what is the velocity in m/s
40 m
A sprinter accelerates at 5m/s how far will she travel in 4 sec if she starts a 0
4.9m
After 1 sec a ball dropped from rest will have fallen
1.5
Agallon of paint will cover 300ft2. How many gallons will you need to paint a 12ftX18ft wall with two coats of this paint
4,400
An airplane is flying at 95m/s when the engine is turned off. As it glides it experiences a force of drag so that it slows down at -.700m/s2. How far in meters will it travel in 1 min
49m/s
An iron vise falls from rest at a great height. Neglecting air resistance, what acceration has it fallen in the first 5 seconds?
122m
An iron vise falls from rest at a great height. Neglecting air resistance, what distance has it fallen in the first 5 seconds?
A and B will return at the same time.
Ball A is thrown upward with a velocity of 19.6m/s. Two sec later ball B is thrown with a velocity of 9.8m/s which ball will return first
gravity
Each object is pulled down by the
velocity
The slope of a distance time graph is at a particular instant is the
accerelation
The slope of the velocity time graph at a particular instant is the
same time
Two college students are sliding down a hill on sleds (ignore friction).. one has a mass of 85kg other has a mass of 75kg. Which will reach the bottom of hill first
shorter one
Two moutain bikers rolling down a hill. same mass but one is taller and has more air drag. which will reach the bottom first
velocity is 0 and accerelation is downward
You toss a ball straight up in the air. At the highest point, the ball's
Vector
_____ must have both magnitude and direction given
SI unit of measurement
______ is an absolute system in which massis a fundamental quantity and force is defined unit.
10^-2 (c)
centi
displacement
change in position in a specified direction is called
58.7 ft/s
convert 40mph to ft/s
ampere
current
study of circuits, magnetism, fields, amd electromagnetic radiation
electricity and magnetism
resistance (inertia)
heavier objects have a larger _____to being accelerated
instantaneous speed
if the 't' is very small then 's' is
upwards to the right.
if the acceleration is positive the velocity graph will slope
acceleration
is the rate of change in velocity
10^3 (k)
kilo
meter (m)
length
kilogram (kg)
mass
a study of force, motion, and energy
mechanics
10^6 (M)
mega
10^-6 (u)
micro
10^-3 (m)
milli
10^-9 (n)
nano
speed
rate of travel
d/t
s=
number of reliable digits that's measured
significant figures