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    Physics1 تعديل المشاركة

    Objective questions about about chapter 2 ( One Dimensional Kinematics )

    غير معرف
    03 مايو 2021
    (0)

    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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