Physical Science Chapter 11 Test B
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Physical Science Chapter 11 Test B

Multiple Choice
Identify the choice that best completes the statement or answers the question.


A speed-time graph shows that a car moves at 10 m/s for 10 s. The car’s speed then steadily decreases until it comes to a stop at 30 s. Which of the following describes the slope of the speed-time graph from 10 s to 30 s?
linear, horizontal
linear, sloping downward
curved, upward
linear, sloping upward


An object that is accelerating may be
slowing down.
changing direction.
gaining speed.
all of the above


A train approaching a crossing changes speed from 25 m/s to 10 m/s in 240 s. How can the train’s acceleration be described?
The train’s acceleration is positive.
The train is not accelerating.
The train will come to rest in 6 minutes.
The train’s acceleration is negative.


What is instantaneous acceleration?
how fast a speed is changing at a specific instant
how fast a velocity is changing at a specific instant
how fast a direction is changing at a specific instant
all of the above


Which of the following statements is true?
An object that is accelerating is always changing direction.
An object has an instantaneous acceleration, even if the acceleration vector is zero.
An object at rest has an instantaneous acceleration of zero.
Instantaneous acceleration is always changing.

Complete each statement.


The motion of an object looks different to observers in different ______________________________.



The SI unit for measuring ____________________ is the meter.



The direction and length of a straight line from the starting point to the ending point of an object’s motion is ____________________.



Displacement and velocity are examples of ____________________ because they have both magnitude and direction.



The sum of two or more vectors is called the _________________________.



Speed is measured in units of _________________________.



A car’s speedometer measures _________________________.



co013-1.jpg is the equation that defines _________________________.



A constant slope on a distance-time graph indicates ____________________ speed.



The difference between speed and velocity is that velocity indicates the ____________________ of motion and speed does not.



A distance-time graph indicates an object moves 20 km in 4 h. The average speed of the object is ____________________ km/h.



Because its ____________________ is always changing, an object moving in a circular path experiences a continuous change in velocity.



Two or more velocities add by _________________________.



A moving object does not ____________________ if its velocity remains constant.



Freely falling objects accelerate at 9.8 m/s2 because the force of ____________________ acts on them.



The velocity of an object moving in a straight line changes at a constant rate when the object is experiencing constant ____________________.



The acceleration of a moving object is calculated by dividing the change in ____________________ by the time over which the change occurs.



Accelerated motion is represented by a(an) ____________________ line on a distance-time graph.



A car that increases its speed from 20 km/h to 100 km/h undergoes ____________________ acceleration.



______________________________ is how fast a velocity is changing at a specific instant.


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