ch4 physics Word Scramble

Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

Normal Size Small Size show me how

Question	Answer
You can describe the motion of an object by what?	its position, speed, direction, and acceleration
Motion is everywhere. Easy to __________, hard to _________.	recognize, describe
Who helped explain motion by studying balls rolling on inclined planes?	Galileo
Who were confused about motion?	the Ancient Greeks
An object is moving if its ________ relative to a fixed point is ________.	position, changing
What means in respect to something else?	relative
A book is relative to a ____.	desk
The Earth is relative to the ___.	sun
Even things that appear to be at rest ____.	move
A book that is at rest, relative to the table it lies on, is moving at about ______ relative to the sun.	30 km/s
The book moves even ______ relative to the center of our ______.	faster, galaxy
Although you may be at rest relative to Earth's surface, you're moving at about _________ relative to the ___.	100,000 km/h, sun
Who was speed first calculated by?	Galileo
Speed is how ____ something is moving.	fast
Speed is a ____.	rate
Speed is distance per ____.	time
Units for speed could include any combination of units for ________ and ____.	distance, time
The fastest unit for speed is miles per hour. In symbols =	mi/h
The second fastest unit for speed is kilometers per hour. In symbols =	km/h
The second slowest unit for speed is centimeters per ___.	centimeters
The slowest unit for speed is light-years per _______.	century
We will primarily use the unit ______ per second (m/s) for speed.	meters
What's the fastest land animal over distances less than 500 meters and can achieve peak speeds of 100 km/h?	a cheetah
If a cheetah covers 50 meters in a time of 2 seconds, its speed is ____.	25 m/s
In what two ways can speed be described as?	instantaneous and average
What is the speed at any moment in time?	instantaneous
Instantaneous speed is shown on the __________ of a car.	speedometer
What speed is the total distance covered divided by the total time?	average
Does the tortoise or the hare run at a faster speed?	the hare
Does the tortoise or the hare have the faster average speed?	the tortoise
KNOW WHY THE TORTOISE WON THE RACE IN TERMS OF INSTANTANEOUS AND AVERAGE SPEEDS	KNOW WHY THE TORTOISE WON THE RACE IN TERMS OF INSTANTANEOUS AND AVERAGE SPEEDS
Speed is a description of how fast an object moves; ________ is how fast and in what direction it moves.	velocity
What is speed in a given direction?	velocity
What are the two components of velocity?	speed and direction
Velocity is a ______ quantity because it gives direction as well as _________(speed).	vector, magnitude
3 m/s north is an example of what?	velocity
________ velocity means that both aspects of velocity must remain unchanged.	Constant
Constant velocity maintains the same _____, same _________, and continues in a straight line.	speed, direction
________ velocity means that either or both aspects of velocity must be changing.	Changing
Changing velocity maintains different _____ and _________.	speed, direction
The car is driving in a circle and its speed is remaining at 25 km/h, is its velocity constant or changing and why?	It is changing velocity because its direction is changing.
On a car, there are 3 controls that can change ________.	velocity
What control increases speed?	the gas pedal
What control decreases speed?	the brake
What control changes direction?	the steering wheel
A car is traveling northward at 60 km/h. It passes another car traveling southward at 60 km/h. Do both cars have the same speed? Do they have the same velocity?	They have the same speed but they have opposite velocities because they are moving in different directions.
____________ is the rate at which velocity changes.	Acceleration
For acceleration to occur, speed must ________ or ________, or direction must change.	increase, decrease
What is deceleration?	negative acceleration
To accelerate in the direction of velocity means to _______.	speed up
To accelerate against velocity means to ________.	slow down
To accelerate at an angle to velocity means to change _________.	direction
The unit for time appears _____: once for the unit of speed and again for the interval of time in which the speed is changing.	twice
A car moving in a straight line steadily increases its speed each second, first from 35 to 40 km/h, then from 40 to 45 km/h, then from 45 to 50 km/h. What is its acceleration?	The speed increases by 5 km/h each 1s interval in a straight line.
What is the acceleration of an object in free fall?	about 10 meters per second squared (10 m/s squared)
A falling object ___________ as it falls.	accelerates
What causes the acceleration of an object?	gravity
________ is motion due only to the effect of gravity.	Free fall
What is the time that passes from the beginning of the free fall?	elapsed time
If one considers the speed of a falling rock, what develops?	a pattern
In 5 seconds a car moving in a straight line increases its speed from 50 km/h to 65 km/h, while a truck goes from rest to 15 km/h in a straight line. Which undergoes greater acceleration? What is the acceleration of each vehicle?	The car and the truck both increase their speed by 15 km/h during the same time interval, so their acceleration is the same.
If the elapsed time is 2, the instantaneous speed is __. If the elapsed time is 5, the instantaneous speed is __.	20, 50
During each second of fall the __________ speed of the object increases by an additional __ meters per second.	instantaneous, 10
What is the gain in speed per second?	acceleration
The unit of speed occurs twice, once for _____ and once for the ____________.	speed, time interval
The instantaneous speed of an object falling from rest is equal to what?	the acceleration multiplied by the elapsed time
What is the average speed of any object moving in a straight line with constant acceleration?	the average of the initial speed and the final speed
The average speed of a freely falling object in its first second of fall is the ___ of the initial speed of zero and the final speed of 10 m/s, _______ by 2, or 5 m/s.	sum, divided
Average speed is _________ from instantaneous speed.	different
Objects thrown straight upward gradually ________ speed (upward) and stop at the top.	decrease
Objects thrown straight upward gradually ________ speed (downward).	increase
Any change in the object thrown straight upward is due to _______.	gravity
What would the speedometer reading on the falling rock be 4.5 seconds after it drops from rest?	45 m/s
What would the speedometer reading on the falling rock be 8 seconds after it drops from rest?	80 m/s
For each second of free fall, an object falls a _______ distance than it did in the previous second.	greater
At the end of the first second, the free-falling object has an instantaneous speed of what?	10 m/s
What is the initial speed of an object in free fall in the first second?	0 m/s
During the first second, the object has an average speed of 5 m/s, so it falls a distance of _________.	5 meters
If a falling rock is equipped with an odometer, the readings of distance fallen ________ with time.	increase
For freely falling objects, what increases each second?	velocity
For freely falling objects, what remains at a constant rate, g?	acceleration
The distance a freely falling object falls each second _________.	increases
On what kind of graph does the slope represent speed per time, or acceleration?	speed-versus-time graph
True or false? Equations and tables are not the only way to describe relationships such as velocity and acceleration.	True
Graphs can visually describe _____________.	relationships
On a speed-versus-time graph, the speed(v) of a freely falling object can be plotted on the ________ axis and time(t) on the __________ axis.	vertical, horizontal
What does the "curve" that best fits the points form?	a straight line
For every increase of 1s on a speed-versus-time graph, there is the same 10 m/s increase in _____. Mathematicians call this _________.	speed, linearity
Since the object is dropped from rest, the line on a speed-versus-time graph starts at the origin, where both v and t are ____.	zero
If we double t, we ______ v; if we triple t, we ______ v; and so on. This particular linearity is called a direct proportion.	double, triple
Time and speed are directly ____________ to each other.	proportional
The curve on a speed-versus-time graph is a ________ line, so its slope is ________.	straight, constant
For 10 m/s of vertical change there is a horizontal change of __.	1s
If the acceleration on a speed-versus-time graph were greater, the slope of the graph would be _______.	steeper
VIEW ALL CHARTS AND GRAPHS IN NOTES	VIEW ALL CHARTS AND GRAPHS IN NOTES
What is a decreasing acceleration or negative acceleration called?	deceleration
Constant speed is called ____ acceleration.	zero
When the distance(d) traveled by a freely falling object is plotted on the vertical axis and time(t) on the horizontal axis, the result is a ______ line.	curved
The distance-versus-time graph is _________.	parabolic
The relationship between distance and time is _________.	nonlinear (not straight)
The relationship between distance and time is _________ and the curve is parabolic - when we double t, we do not double d; we _________ it.	quadratic, quadruple
What does distance depend on?	time squared
How do you find the average speed(v)?	d/t
How do you find the acceleration(a)?	vf-vi/t
How do you find the instantaneous speed(v)?	gt
How do you find the distance(d)?	1/2g t squared
A curved line also has a _____ - different at different points.	slope
The slope of the curve on a distance-versus-time graph is _____.	speed
The slope ________(becomes greater) as time passes, which shows that speed _________ as time passes.	steepens, increases
Air resistance noticeably _____ the motion of things with large surface areas like falling feathers or pieces of paper. But air resistance ____ noticeably affects the motion of more compact objects like stones and baseballs.	slows, less
If you drop a feather and a coin in air, the ____ hits the ground first because the ___ affects the feather more than the coin.	coin, air
The dropped feather has more _______ ____ than the coin.	surface area
If you drop a feather and a coin in a vacuum, they both hit at the ____ ____.	same time
What is the rate at which velocity changes?	acceleration
"How fast" and "how far" are completely _________.	different
How fast something freely falls from rest after a certain elapsed time is _____ or ________.	speed, velocity
How far the object has fallen is ________.	distance
How quickly speed (or velocity) changes is ____________.	acceleration
What makes acceleration so complex?	that it is a rate of a rate
Acceleration is often confused with ________, which itself is a rate (the rate at which distance is covered).	velocity
Acceleration is NOT ________, nor is it even a ______.	velocity, change

Created by: jessicamoore