what is acceleration? (pp. 22–23)
1. what is acceleration?
2. acceleration involves a change in either ______
3. any time the speed of an object increases, the object undergoes ______
4. is the following sentence true or false? acceleration refers to increasing speed, decreasing speed, or changing direction.
5. deceleration is another word for negative ______
6. is the following sentence true or false? an object can be accelerating even if its speed is constant. ______

Question

Accepted Answer

### Question 1: What is acceleration?
# Brief Explanations:
Acceleration in physics (subfield of Natural Science: Physics) is defined as the rate of change of velocity of an object with respect to time. Velocity is a vector quantity that includes both speed and direction, so acceleration can result from a change in speed (speeding up or slowing down) or a change in direction (even if speed is constant, like in circular motion). In formula terms, acceleration $ a=\frac{\Delta v}{\Delta t} $, where $ \Delta v $ is the change in velocity and $ \Delta t $ is the change in time.
# Answer:
Acceleration is the rate of change of an object's velocity with respect to time, involving changes in speed (increasing or decreasing) or direction.

### Question 2: Acceleration involves a change in either ______
# Brief Explanations:
From the definition of acceleration (related to velocity), velocity has two components: speed (magnitude) and direction. So acceleration occurs when there's a change in speed (how fast the object is moving) or a change in direction (the path the object is taking, like turning). So the blanks should be filled with "speed" and "direction" (or in the context of the question's phrasing, likely "speed" and "direction" as the two aspects of velocity that can change to cause acceleration).
# Answer:
speed and direction

### Question 3: Any time the speed of an object increases, the object undergoes ______
# Brief Explanations:
When an object's speed increases, its velocity is changing (since speed is the magnitude of velocity). By the definition of acceleration, an increase in speed (a type of change in velocity) means the object is accelerating. Specifically, this is positive acceleration (or just acceleration, as acceleration is a vector, but in the context of increasing speed, it's acceleration in the direction of motion).
# Answer:
acceleration (or positive acceleration)

### Question 4: Is the following sentence true or false? Acceleration refers to increasing speed, decreasing speed, or changing direction.
# Brief Explanations:
As per the definition of acceleration, acceleration is the rate of change of velocity. Velocity changes when speed (magnitude) changes (increasing or decreasing) or when direction changes (even if speed is constant). So increasing speed (positive acceleration), decreasing speed (negative acceleration or deceleration), and changing direction (like in circular motion where speed may be constant but velocity changes) all involve acceleration. So the statement is true.
# Answer:
True

### Question 5: Deceleration is another word for negative ______
# Brief Explanations:
Deceleration is the term used when an object's speed is decreasing, which means the acceleration is in the opposite direction of the object's velocity. So deceleration is negative acceleration (since acceleration is a vector, and if the object is slowing down, the acceleration vector is opposite to the velocity vector, hence negative in the coordinate system where velocity is positive). So the blank is "acceleration".
# Answer:
acceleration

### Question 6: Is the following sentence true or false? An object can be accelerating even if its speed is constant.
# Brief Explanations:
Acceleration depends on the change in velocity, not just speed. Velocity is speed with a direction. So if an object is moving at a constant speed but changing direction (like a car going around a curve at constant speed, or a planet orbiting the sun), its velocity is changing (because direction is changing). Since acceleration is the rate of change of velocity, this means the object is accelerating. So the statement is true.
# Answer:
True

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Question 1: What is acceleration?

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Question 2: Acceleration involves a change in either ______