Question

What component of an acceleration vector is responsible for causing an object to speed up or slow down?

1. The component of $LaTeX: \vec a$ that is parallel to the velocity vector.

2. The component of $LaTeX: \vec a$ that is non-zero.

3. The component of $LaTeX: \vec a$ that is perpendicular to the velocity vector.

4. The component of $LaTeX: \vec a$ that is horizontal.

5. The component of $LaTeX: \vec a$ that is vertical.

6. The component of $LaTeX: \vec a$ that is parallel to the $LaTeX: \hat i$ direction.

7. The component of $LaTeX: \vec a$ that is parallel to the $LaTeX: \hat j$ direction.

8. The radial component of $LaTeX: \vec a$ .

Answer 1

What component of an acceleration vector is responsible for causing an object to speed up or slow down?

$\Rightarrow$ The component of $\vec{a}$ that is parallel to the velocity vector.

Option (1) : it will be correct.

Explanation : We know that, an acceleration is a vector quantity in the same direction as the change in velocity . An object is accelerating if it is changing its velocity. If an object is not changing its velocity, then the object is not accelerating. When an object slows down, its acceleration is opposite to the direction of its motion. This is also known as deceleration.