Question

A bob of mass m attached to the end of a string is swung in a horizontal circle, as shown. When the bob is at point A, the direction of the velocity, centripetal force, and centripetal acceleration vectors, respectively, are in which direction?

• A. $\to ,\leftarrow ,\leftarrow$
• B. $\downarrow ,\to ,\to$
• C. $\downarrow ,\to ,\leftarrow$
• D. $\uparrow ,\to ,\to$
• E. $\downarrow ,\leftarrow ,\leftarrow$

Answer 1

Answer: (D)

$\uparrow ,\to ,\to$

The velocity of an object moving in a circle is in the direction of the tangent to the circle at that point.

The centripetal force is equal to $\frac{m{v}^2}{R}$ and acts on the object in the direction of center of the circle. Hence towards right.

The centripetal acceleration is in the direction in which the centripetal force is acting. Hence towards right.