Speed And Velocity 1 Question Preview (ID: 17587)
Speed And Velocity.
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If you were standing under a tree, which object would appear to be moving?
a) the tree
b) the airplane
c) the boy
d) the building
A passenger in the rear seat of a car moving at a steady speed is at rest relative to
a) the side of the road
b) a pedestrian on the corner ahead
c) the front seat of the car
d) the wheels of the car
Which distance can be most accurately measured with a ruler?
a) the length of a river
b) the width of a book
c) the distance between two cities
d) the size of an object under a microscope
One kilometer equals 1000 meters. What does the prefix kilo- mean?
a) 1
b) 10
c) 100
d) 1000
What is the most appropriate SI unit to express the speed of a cyclist in the last leg of a 10 km race?
a) km/s
b) km/h
c) mm/s
d) cm/h
Speed is the ratio of the distance an object moves to
a) the amount of time needed to travel the distance
b) the direction the object moves
c) the displacement of the object
d) the motion of the object
Instantaneous speed is measured
a) at the starting point
b) when the object reaches it destination
c) at a particular instant
d) over the duration of the trip
The slope of a line on a distance-time graph is
a) distance
b) time
c) speed
d) displacement
The rate at which velocity changes is called
a) speed
b) vectors
c) acceleration
d) motion
Which example identifies a change in motion that produces acceleration?
a) a speed skater moving at a constant speed on a straight track
b) a ball moving at a constant speed around a circular track
c) a particle moving in a vaccuum at constant velocity
d) a vehicle moving down the street at a steady speed
Objects in free fall near the surface of the Earth experience
a) constant speed
b) constant velocity
c) constant acceleration
d) constant distance
Which example describes constant acceleration due ONLY to a change in direction?
a) increasing speed while traveling around a curve
b) an object at rest
c) traveling around a circular track
d) an object in free fall
The slope of a speed-time graph indicates
a) direction
b) acceleration
c) velocity
d) speed
An object that is accelerating may be
a) slowing down
b) gaining speed
c) changing direction
d) all of the above
What is instantaneous acceleration?
a) how fast a speed is changing at a specific instant
b) how fast a velocity is changing at a specific instant
c) how fast a direction is changing at a specific instanct
d) all of the above
Which of the following statements is true?
a) an object that is accelerating is always changing direction
b) an object that has an instantaneous acceleration, even if the acceleration vector is zero
c) an object at rest has an instantaneous acceleration of zero
d) instantaneous acceleration is always changing
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