Acceleration occurs when an object undergoes a) a speed increase b) a speed decrease c) a change in the direction of travel d) any of the above
The Correct Answer and Explanation is:
The correct answer is d) any of the above.
Explanation:
Acceleration is defined as the rate at which an object changes its velocity. Velocity is a vector quantity, meaning it has both magnitude (speed) and direction. Therefore, acceleration can result from any change in velocity, which includes changes in speed, changes in direction, or both.
Here’s a breakdown:
- Increase in Speed (Positive Acceleration):
When an object speeds up, its velocity increases, and it experiences positive acceleration. For example, when a car accelerates from rest, it is increasing its speed, which results in a positive change in velocity. - Decrease in Speed (Negative Acceleration or Deceleration):
Acceleration can also occur when an object slows down. This is called negative acceleration or deceleration. For instance, when a car applies brakes, it reduces its speed, causing the velocity to decrease over time. The rate at which the car slows down is considered negative acceleration. - Change in Direction (Centripetal Acceleration):
Acceleration does not require a change in speed. If an object changes direction, its velocity changes, even if its speed remains constant. A classic example is an object moving in a circular path, like a car turning around a curve. Although the speed of the car may stay the same, its direction is changing continuously, which means it is undergoing acceleration. This type of acceleration is called centripetal acceleration.
In conclusion, acceleration can occur when an object either speeds up, slows down, or changes direction. This is why option d) any of the above is the correct answer.
