Chp. 3 Midterm Review Flashcards
If the velocity of an object is zero at some point, then its acceleration must also be zero at that point.
False
If the acceleration of an object is zero, then that object cannot be moving.
False
Suppose that a car traveling to the west begins to slow down as it approaches a traffic light. Which of the following statements about its acceleration is correct?
The acceleration is toward the east
An auto manufacturer advertises that their car can go “from zero to sixty in eight seconds.” This is a description of what characteristic of the car’s motion?
Average Acceleration
Suppose that a car traveling to the west (- x direction) begins to slow down as it approaches a traffic light. Which statement concerning its acceleration must be correct?
It’s acceleration is positive
Suppose that an object is moving with a constant velocity. Which statement concerning its acceleration must be correct?
The acceleration is equal to zero
When a ball is thrown straight up with no air resistance, the acceleration at its highest point
Is downward
Suppose a ball is thrown straight up and experiences no appreciable air resistance. What is its acceleration just before it reaches its highest point?
Exactly g
A ball is thrown downward in the absence of air resistance. After it has been released, which statement(s) concerning its acceleration is correct? (There could be more than one correct choice.)
Its acceleration is constant
Two objects are dropped from a bridge, an interval of 1.0 s apart. Air resistance is negligible. During the time that both objects continue to fall, their separation
Increases
Brick A is dropped from the top of a building. Brick B is thrown straight down from the same building, and neither one experiences appreciable air resistance. Which statement about their accelerations is correct?
The two bricks have exactly the same acceleration
The slope of a position versus time graph gives
Velocity
An object is moving with constant non-zero acceleration in the + x direction. The velocity versus time graph of this object is
A straight line making an angle with the time axis
The slope of a velocity versus time graph gives
Acceleration
If the position versus time graph of an object is a horizontal line, the object is
At rest
If the velocity versus time graph of an object is a horizontal line, the object is
Moving with zero acceleration
If the velocity versus time graph of an object is a straight line making an angle of +30° (counter clockwise) with the time axis, the object is
Moving with constant non zero acceleration
