Chapter 1 Motion
Speed in a given direction is called velocity
True
A speedometer shows the______________________speed of a vehicle.
directional
The SI unit for speed is m/min.
false
An object is ________________________if its position changes relative to another object.
in motion
On a graph showing distance versus time, a horizontal line represents an object that is
increasing its speed.
There are 1,000 meters in a____________________________.
kilometer
An airplane is accelerating at -8 m/s2. The distance the airplane travels each second is _________________________________ the distance it traveled during the previous second.
less than
Which of the following is the SI unit of acceleration?
m/s^2
The SI unit for measuring distance is the
meter
There are 1,000 __________ in a meter.
millimeters
Which of the following is the best reference point for describing the motion of the planets in our solar system?
the Sun
Jane is sitting in the family car. Her mother is driving her from their house to the library. Jane waves as she passes her friend Marina. Which of the following is not moving with respect to Jane?
the family car
Jeff is in a stationary school bus. Which is the best reference point for him to use to determine when the bus starts to move?
the front entrance of the school
To describe an object's motion, you need to know both its speed and its__________________________.
velocity
When you know both the speed and direction of an object's motion, you know the
velocity of the object.
International System of Units
the system of units (SI) used by scientists to measure the properties of matter
instantaneous speed
the speed of an object at one instant of time
Speed equals distance divided by
time
The International System of Units is used by scientists
all over the world.
The_________________speed of an object is found by dividing the total distance by the total time.
average
A______________________is a place or object used for comparison to determine if something is in motion.
reference point
The steepness of a line on a graph is called the
slope
Velocity
the speed and direction of a moving object
An airplane is accelerating at 8 m/s2. Each second its speed increases by _____________________m/s.
8
reference point
A place or object used for comparison to determine if an object is in motion
Speed
The distance an object travels per unit of time
slope
The steepness of a line on a graph
On a distance-versus-time graph, a speed of zero would appear as a horizontal line.
True
An object changing direction is an example of
acceleration
The rate at which the velocity of an object changes is the object's rate of__________________.
acceleration
The rate at which velocity changes is called
acceleration
If a train is slowing down, it is accelerating.
True
Motion
change in position
An amusement park ride falls straight down for 4 seconds. During this time, the ride accelerates from a speed of 0 m/s to 40 m/s. The ride's rate of acceleration during the 4 seconds is ________________________________ m/s2.
Choose... 10 20 40
________________________________is the length of the path between two points
Distance
A Ferris wheel turning at a constant speed of 5 m/s is not accelerating.
False
A distance-versus-time graph will never show a horizontal line.
False
A speed-versus-time graph for a car's motion is a horizontal line at a speed of 12 m/s. The car's acceleration during this time is 12 m/s2.
False
An airplane is flying west at 200 km/h. Two hours later, it is flying west at 300 km/h. Its average acceleration is 100 km/h2.
False
On a distance-versus-time graph, a straight line indicates that an object's speed is zero.
False
The SI units for acceleration are KM/H2.
False
The slope of a line is found by multiplying the rise by the run.
False
To find the acceleration of an object moving in a straight line, you must calculate the change in distance for each unit of time.
False
distance
How far an object moves
Which is the best reason for not using a moving car as a reference point?
It is difficult to determine which direction motion is occurring
