physics notes for ch.4
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| You can describe the motion of an object by what? | show 🗑
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| show | recognize, describe
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| Who helped explain motion by studying balls rolling on inclined planes? | show 🗑
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| Who were confused about motion? | show 🗑
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| show | position, changing
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| show | relative
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| show | desk
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| show | sun
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| Even things that appear to be at rest ____. | show 🗑
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| show | 30 km/s
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| The book moves even ______ relative to the center of our ______. | show 🗑
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| show | 100,000 km/h, sun
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| Who was speed first calculated by? | show 🗑
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| show | fast
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| show | rate
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| show | time
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| Units for speed could include any combination of units for ________ and ____. | show 🗑
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| The fastest unit for speed is miles per hour. In symbols = | show 🗑
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| The second fastest unit for speed is kilometers per hour. In symbols = | show 🗑
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| show | centimeters
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| The slowest unit for speed is light-years per _______. | show 🗑
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| show | meters
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| show | a cheetah
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| If a cheetah covers 50 meters in a time of 2 seconds, its speed is ____. | show 🗑
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| show | instantaneous and average
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| show | instantaneous
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| Instantaneous speed is shown on the __________ of a car. | show 🗑
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| What speed is the total distance covered divided by the total time? | show 🗑
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| Does the tortoise or the hare run at a faster speed? | show 🗑
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| Does the tortoise or the hare have the faster average speed? | show 🗑
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| show | KNOW WHY THE TORTOISE WON THE RACE IN TERMS OF INSTANTANEOUS AND AVERAGE SPEEDS
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| Speed is a description of how fast an object moves; ________ is how fast and in what direction it moves. | show 🗑
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| What is speed in a given direction? | show 🗑
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| show | speed and direction
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| Velocity is a ______ quantity because it gives direction as well as _________(speed). | show 🗑
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| 3 m/s north is an example of what? | show 🗑
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| ________ velocity means that both aspects of velocity must remain unchanged. | show 🗑
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| Constant velocity maintains the same _____, same _________, and continues in a straight line. | show 🗑
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| show | Changing
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| Changing velocity maintains different _____ and _________. | show 🗑
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| show | It is changing velocity because its direction is changing.
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| show | velocity
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| show | the gas pedal
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| show | the brake
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| show | the steering wheel
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| show | They have the same speed but they have opposite velocities because they are moving in different directions.
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| ____________ is the rate at which velocity changes. | show 🗑
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| For acceleration to occur, speed must ________ or ________, or direction must change. | show 🗑
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| What is deceleration? | show 🗑
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| To accelerate in the direction of velocity means to _______. | show 🗑
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| show | slow down
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| show | direction
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| The unit for time appears _____: once for the unit of speed and again for the interval of time in which the speed is changing. | show 🗑
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| 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? | show 🗑
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| show | about 10 meters per second squared (10 m/s squared)
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| show | accelerates
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| show | gravity
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| ________ is motion due only to the effect of gravity. | show 🗑
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| show | elapsed time
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| show | a pattern
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| show | The car and the truck both increase their speed by 15 km/h during the same time interval, so their acceleration is the same.
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| If the elapsed time is 2, the instantaneous speed is __. If the elapsed time is 5, the instantaneous speed is __. | show 🗑
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| During each second of fall the __________ speed of the object increases by an additional __ meters per second. | show 🗑
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| What is the gain in speed per second? | show 🗑
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| show | speed, time interval
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| The instantaneous speed of an object falling from rest is equal to what? | show 🗑
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| What is the average speed of any object moving in a straight line with constant acceleration? | show 🗑
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| show | sum, divided
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| show | different
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| show | decrease
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| show | increase
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| Any change in the object thrown straight upward is due to _______. | show 🗑
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| show | 45 m/s
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| What would the speedometer reading on the falling rock be 8 seconds after it drops from rest? | show 🗑
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| For each second of free fall, an object falls a _______ distance than it did in the previous second. | show 🗑
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| At the end of the first second, the free-falling object has an instantaneous speed of what? | show 🗑
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| What is the initial speed of an object in free fall in the first second? | show 🗑
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| show | 5 meters
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| show | increase
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| show | velocity
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| show | acceleration
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| show | increases
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| show | speed-versus-time graph
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| show | True
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| Graphs can visually describe _____________. | show 🗑
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| show | vertical, horizontal
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| show | a straight line
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| show | speed, linearity
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| show | zero
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| If we double t, we ______ v; if we triple t, we ______ v; and so on. This particular linearity is called a direct proportion. | show 🗑
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| Time and speed are directly ____________ to each other. | show 🗑
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| The curve on a speed-versus-time graph is a ________ line, so its slope is ________. | show 🗑
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| show | 1s
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| If the acceleration on a speed-versus-time graph were greater, the slope of the graph would be _______. | show 🗑
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| show | VIEW ALL CHARTS AND GRAPHS IN NOTES
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| What is a decreasing acceleration or negative acceleration called? | show 🗑
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| show | zero
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| show | curved
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| The distance-versus-time graph is _________. | show 🗑
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| show | nonlinear (not straight)
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| The relationship between distance and time is _________ and the curve is parabolic - when we double t, we do not double d; we _________ it. | show 🗑
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| show | time squared
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| show | d/t
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| How do you find the acceleration(a)? | show 🗑
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| How do you find the instantaneous speed(v)? | show 🗑
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| How do you find the distance(d)? | show 🗑
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| A curved line also has a _____ - different at different points. | show 🗑
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| show | speed
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| The slope ________(becomes greater) as time passes, which shows that speed _________ as time passes. | show 🗑
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| 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. | show 🗑
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| If you drop a feather and a coin in air, the ____ hits the ground first because the ___ affects the feather more than the coin. | show 🗑
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| The dropped feather has more _______ ____ than the coin. | show 🗑
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| show | same time
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| show | acceleration
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| "How fast" and "how far" are completely _________. | show 🗑
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| show | speed, velocity
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| How far the object has fallen is ________. | show 🗑
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| show | acceleration
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| show | that it is a rate of a rate
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| Acceleration is often confused with ________, which itself is a rate (the rate at which distance is covered). | show 🗑
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| Acceleration is NOT ________, nor is it even a ______. | show 🗑
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You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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