The questions address the following topics
اسئلة موضوعية على الفصل الثاني ( الحركة في بعد واحد ) ويدرس المواضيع التالية
- Position
- Velocity
- Instantaneous Velocity and Speed
- Acceleration
- Motion Diagrams
- One-Dimensional Motion with Constant Acceleration
- Freely Falling Objects
- Kinematics Equations Derived from Calculus
Two cars are traveling at the same speed and hit the brakes at the same time. One car has double the deceleration of the other. By what factor does the time required to stop that car compare with that for the other car
Solution
It takes half as long to stop
Two cars are traveling at the same speed and hit the brakes at the same time. One car has double the deceleration of the other. By what factor does the distance required to stop that car compare with that for the other car
Solution
It takes half the distance to stop
Car A is traveling at twice the speed of car B. They both hit the brakes at the same time and undergo identical decelerations. How does the time required for car A to stop compare with that for car B
Solution
Car A takes twice as long to stop
Car A is traveling at twice the speed of car B. They both hit the brakes at the same time and undergo identical decelerations. How does the distance required for car A to stop compare with that for car B
Solution
It takes four times the distance to stop
A stone is thrown straight up. What is its acceleration on the way up
Solution
9.8 m/s2 downward
A stone is thrown straight up. What is its acceleration on the way down
Solution
9.8 m/s2 downward
A stone is thrown straight up. What is its acceleration at the highest point
Solution
9.8 m/s2 downward
It is possible to have a zero acceleration, and still be moving
Solution
TRUE
When the velocity and acceleration of an object have the same sign, the speed of the object increases
Solution
TRUE
When the velocity and acceleration of an object have opposite signs, the speed of the object increases
Solution
FALSE
The average velocity of a car traveling with a constant acceleration during a certain time interval is equal to the mean of the velocities at the beginning and end of that time interval
Solution
TRUE
Free fall is the motion of an object subject only to the influence of gravity
Solution
TRUE
An object is in free fall as soon as it is released, whether it is dropped from rest, thrown downward, or thrown upward
Solution
TRUE
An object thrown downward does not experience free fall
Solution
FALSE
An object thrown upward experiences free fall
Solution
TRUE
You drive 6.00 km at 50.0 km/h and then another 6.00 km at 90.0 km/h. Your average speed over the 12.0 km drive will be
Solution
less than 70.0 km/h
The slope of a line connecting two points on a position versus time graph gives
Solution
average velocity
Which statement is correct about the relationship between the average speed and the magnitude of the average velocity for any motion
Solution
The average speed is always greater than or equal to the magnitude of the average velocity
The slope of a tangent line at a given time value on a position versus time graph gives
Solution
instantaneous velocity
When is the average velocity of an object equal to the instantaneous velocity
Solution
only when the velocity is constant
Which statement is correct about the relationship between the instantaneous speed and the magnitude of the instantaneous velocity
Solution
The instantaneous speed is always equal to the magnitude of the instantaneous velocity
Suppose that an object is moving with a constant velocity. Make a statement concerning its acceleration
Solution
The acceleration must be equal to zero
At a given instant, the acceleration of a certain particle is zero. This means that
Solution
the velocity is not changing at that instant
The slope of a line connecting two points on a velocity versus time graph gives
Solution
average acceleration
The slope of a tangent line at a given time value on a velocity versus time graph give
Solution
instantaneous acceleration
Suppose that an object is moving with constant acceleration. Which of the following is an accurate statement concerning its motion
Solution
In equal times its velocity changes by equal amounts
During the time that the acceleration of a particle is constant, its velocity-vs.-time curve is
Solution
a straight line
The motion of a particle is described in the velocity vs. time graph shown in Figure 2-1. We can say that its speed
Solution
increases
Suppose that a car traveling to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration.
Solution
B) The car is decelerating, and its acceleration is negative.
Suppose that a car traveling to the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration.
Solution
A) The car is decelerating, and its acceleration is positive.
An object is moving with constant non-zero velocity in the +x-axis. The position versus time graph of this object is
Solution
C) a straight line making an angle with the time axis.
An object is moving with constant non-zero acceleration in the +x-axis. The position versus time graph of this object is
Solution
D) a parabolic curve.
An object is moving with constant non-zero velocity in the +x-axis. The velocity versus time graph of this object is
Solution
A) a horizontal straight line.
An object is moving with constant non-zero acceleration in the +x-axis. The velocity versus time graph of this object is
Solution
C) a straight line making an angle with the time axis.
If the position versus time graph of an object is a horizontal line, the object is
Solution
C) at rest.
If the velocity versus time graph of an object is a horizontal line, the object is
Solution
moving with constant non-zero speed
If the velocity versus time graph of an object is a straight line making an angle of 30 degrees with the time axis, the object is
Solution
moving with constant non-zero acceleration
The area under a curve in a velocity versus time graph gives
Solution
displacement
A car moving initially with velocity v0 with deceleration a comes to a full stop after traveling a distance d. We can say that the velocity of the car after traveling a distance d/2 is
Solution
greater than v0/2
A car traveling with velocity v is decelerated by a constant acceleration of magnitude a. It travels a distance d before coming to rest. If its initial velocity were doubled, the distance required to stop would
Solution
quadruple
A car traveling with velocity v is decelerated by a constant acceleration of magnitude a. It takes a time t to come to rest. If its initial velocity were doubled, the time required to stop would
Solution
double as well
A stone is thrown straight up. When it reaches its highest point,
Solution
its velocity is zero and its acceleration is not zero
Suppose a ball is thrown straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is going up.
Solution
Its velocity points upward and its acceleration points downward
Two athletes jump straight up. John has twice the initial speed of Harry. Compared to Harry, John stays in the air
Solution
twice as long
wo athletes jump straight up. John has twice the initial speed of Harry. Compared to Harry, John jumps
Solution
four times as long
Two objects are dropped from a bridge, an interval of 1.0 s apart. During the time that both objects continue to fall, their separation
Solution
increases
From the edge of a roof top you toss a green ball upwards with initial velocity v0 and a blue ball downwards with the same initial velocity. When they reach the ground below,
Solution
the two balls will have the same speed
You drop a stone from a bridge to the river below. After this stone has traveled a distance d, you drop a second stone. The distance between the two stones will always
Solution
increases
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