It means constant acceleration (positive or negative).
21.Can acceleration be negative if velocity is negative?
Yes, if velocity is negative (moving backward) and acceleration is negative, the object is speeding up in the backward direction.
22.What is the acceleration at terminal velocity?
Zero, because the net force is zero (gravity equals air resistance).
23.Why is a car turning a corner accelerating?
Because its direction is changing, which changes its velocity vector.
24.Is the acceleration of a planet in orbit constant?
The magnitude of acceleration is constant, but the direction is always changing toward the sun.
25.What is the difference between instantaneous and average acceleration?
Instantaneous is at a specific point in time; average is over a time interval.
26.Can you have acceleration without velocity?
No, acceleration is the rate of change of velocity, so it implies velocity exists, but velocity can be zero at an instant.
27.How does air resistance affect acceleration?
It reduces the net acceleration of a falling object by opposing gravity.
28.What is the acceleration of an object at rest?
Zero, if it remains at rest (net force is zero).
29.Why is understanding acceleration important for car safety?
High acceleration (both positive and negative) affects how quickly a car can stop or start, impacting safety.
30.How can I improve my understanding of these concepts?
Practice graphing, use real-world examples, and apply the concepts to everyday observations.
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