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ch. 2 (physics) / 2.1
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Terms in this set (50)
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?
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?
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?
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?
It takes four times the distance to stop.
A stone is thrown straight up. What is its acceleration on the way up?
9.8 m/s2 downward
A stone is thrown straight up. What is its acceleration on the way down?
9.8 m/s2 downward
A stone is thrown straight up. What is its acceleration at the highest point?
9.8 m/s2 downward
It is possible to have a zero acceleration, and still be moving.
TRUE
When the velocity and acceleration of an object have the same sign, the speed of the object increases.
TRUE
When the velocity and acceleration of an object have opposite signs, the speed of the object increases.
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.
TRUE
Free fall is the motion of an object subject only to the influence of gravity.
TRUE
An object is in free fall as soon as it is released, whether it is dropped from rest, thrown downward, or thrown upward.
TRUE
An object thrown downward does not experience free fall.
FALSE
An object thrown upward experiences free fall.
TRUE
Suppose that an object travels from one point in space to another. Make a comparison between the displacement and the distance traveled.
C) The displacement is either less than or equal to the distance traveled.
Which statement below about the distance between the starting and ending positions and the displacement between the starting and ending positions is correct?
The distance between the starting and B) ending positions is equal to the magnitude of the displacement between the starting and ending positions.
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
C) less than 70.0 km/h.
The slope of a line connecting two points on a position versus time graph gives
C) average velocity.
Which statement is correct about the relationship between the average speed and the magnitude of the average velocity for any motion?
B) 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
B) instantaneous velocity.
When is the average velocity of an object equal to the instantaneous velocity?
C) only when the velocity is constant
Which statement is correct about the relationship between the instantaneous speed and the magnitude of the instantaneous velocity?
B) 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.
D) The acceleration must be equal to zero.
At a given instant, the acceleration of a certain particle is zero. This means that
D) the velocity is not changing at that instant.
The slope of a line connecting two points on a velocity versus time graph gives
E) average acceleration.
The slope of a tangent line at a given time value on a velocity versus time graph give
D) instantaneous acceleration.
Suppose that an object is moving with constant acceleration. Which of the following is an accurate statement concerning its motion?
B) 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
A) 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
A) 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.
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.
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
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
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
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
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
C) at rest.
If the velocity versus time graph of an object is a horizontal line, the object is
A) 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
B) moving with constant non-zero acceleration.
The area under a curve in a velocity versus time graph gives
B) 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
A) 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
D) 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
A) double as well.
A stone is thrown straight up. When it reaches its highest point,
B) 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.
B) 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
C) twice as long.
wo athletes jump straight up. John has twice the initial speed of Harry. Compared to Harry, John jumps
E) 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
A) 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,
C) 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
A) increases.
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