Chapter 2 Conceptual Questions- Motion along a Straight Line

One object is thrown vertically upward with an initial velocity of 100 m/s and another object with an initial velocity of 10 m/s. The maximum height reached by the first object will be ____ that of the other 10 times 100 times 1000 times 10, 000 times none of these

100 times

A ball is in free fall. Its acceleration is: downward during both ascent and descent downward during ascent and upward during descent upward during ascent and downward during descent upward during both ascent and descent downward at all times except at the very top, when it is zero

downward during both ascent and descent

A particle moves along the x axis according to the equation x = 6t^2, where x is in meters and t is in seconds. Therefore: the acceleration of the particle is 6 m/s2 t cannot be negative the particle follows a parabolic path each second the velocity of the particle changes by 9.8 m/s none of the above

none of the above

A particle moves along the x axis from xi to xf . Of the following values of the initial and final coordinates, which results in the displacement with the largest magnitude? xi=4m,xf=6m xi=−4m,xf=−8m xi=−4m,xf=2m xi=4m,xf=−2m xi=−4m,xf=4m

xi=−4m,xf=4m

A particle moves along the x axis from xi to xf . Of the following values of the initial and final coordinates, which results in a negative displacement? xi=4m,xf=6m xi=−4m,xf=−8m xi=−4m,xf=2m xi=−4m,xf=−2m xi=−4m,xf=4m

xi=−4m,xf=−8m

A car starts from Hither, goes 50 km in a straight line to Yon, immediately turns around, and returns to Hither. The time for this round trip is 2 hours. The magnitude of the average velocity of the car for this round trip is: A. 0 B. 50 km/hr C. 100 km/hr D. 200 km/hr E. cannot be calculated without knowing the acceleration

0

As a rocket is accelerating vertically upward at 9.8 m/s2 near Earth's surface, it releases a projectile. Immediately after release the acceleration (in m/s2) of the projectile is: 9.8 down 0 9.8 up 19.6 up none of the above

9.8 down

Of the following situations, which one is impossible? A body having velocity east and acceleration east A body having velocity east and acceleration west A body having zero velocity and non-zero acceleration A body having constant acceleration and variable velocity A body having constant velocity and variable acceleration

A body having constant velocity and variable acceleration

A feather, initially at rest, is released in a vacuum 12 m above the surface of the earth. Which of the following statements is correct? The maximum velocity of the feather is 9.8 m/s The acceleration of the feather decreases until terminal velocity is reached The acceleration of the feather remains constant during the fall The acceleration of the feather increases during the fall The acceleration of the feather is zero

The acceleration of the feather remains constant during the fall

Which one of the following statements is correct for an object released from rest? The average velocity during the first second of time is 4.9 m/s During each second the object falls 9.8m The acceleration changes by 9.8 m/s2 every second The object falls 9.8m during the first second of time The acceleration of the object is proportional to its weight

The average velocity during the first second of time is 4.9 m/s

A drag racing car starts from rest at t = 0 and moves along a straight line with velocity given by v = bt2, where b is a constant. The expression for the distance traveled by this car from its position at t = 0 is: bt^3 bt^3 /3 4bt^2 3bt^2 bt^(3/2)

bt^3 /3

The coordinate-time graph of an object is a straight line with a positive slope. The object has: constant displacement steadily increasing acceleration steadily decreasing acceleration constant velocity steadily increasing velocity

constant velocity

The area under a velocity-time graph represents: acceleration change in acceleration speed change in velocity displacement

displacement

A baseball is thrown vertically into the air. The acceleration of the ball at its highest point is: zero g, down g,up 2g, down 2g, up

g, down

An object is thrown vertically upward with a certain initial velocity in a world where the acceleration due to gravity is 19.6 m/s2. The height to which it rises is that to which the object would rise if thrown upward with the same initial velocity on the Earth. Neglect friction. half √2 times twice four times cannot be calculated from the given data

half

An object is shot vertically upward. While it is rising: its velocity and acceleration are both upward its velocity is upward and its acceleration is downward its velocity and acceleration are both downward its velocity is downward and its acceleration is upward its velocity and acceleration are both decreasing

its velocity is upward and its acceleration is downward

Throughout a time interval, while the speed of a particle increases as it moves along the x axis, its velocity and acceleration might be positive and negative, respectively negative and positive, respectively negative and negative, respectively negative and zero, respectively positive and zero, respectively

negative and negative, respectively

A particle moves on the x axis. When its acceleration is positive and increasing: its velocity must be positive its velocity must be negative it must be slowing down it must be speeding up none of the above must be true

none of the above must be true

A ball is in free fall. Upward is taken to be the positive direction. The displacement of the ball during a short time interval is positive during both ascent and descent negative during both ascent and descent negative during ascent and positive during descent positive during ascent and negative during descent none of the above

positive during ascent and negative during descent

An object has a constant acceleration of 3 m/s2. The coordinate versus time graph for this object has a slope: that increases with time that is constant that decreases with time of3m/s of 3 m/s2

that increases with time

Displacement can be obtained from: the slope of an acceleration-time graph the slope of a velocity-time graph the area under an acceleration-time graph the area under a velocity-time graph the slope of an acceleration-time graph

the area under a velocity-time graph

The average speed of a moving object during a given interval of time is always: the magnitude of its average velocity over the interval the distance covered during the time interval divided by the time interval one-half its speed at the end of the interval its acceleration multiplied by the time interval one-half its acceleration multiplied by the time interval.

the distance covered during the time interval divided by the time interval

A freely falling body has a constant acceleration of 9.8 m/s2. This means that: the body falls 9.8 m during each second the body falls 9.8 m during the first second only the speed of the body increases by 9.8 m/s during each second the acceleration of the body increases by 9.8 m/s2 during each second the acceleration of the body decreases by 9.8 m/s2 during each second

the speed of the body increases by 9.8 m/s during each second