# GENERAL KNOWLEDGE

## GK

### PHYSICS

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
When is the pendulum at 0 velocity
 A At its lowest point B At its highest point C It moves at a constant velocity D It is at rest
Explanation:

Detailed explanation-1: -After the lowest point as the pendulum again starts to go up, its speed starts to decrease, and at the highest point on the other side is zero. So kinetic energy will start to decrease with speed and at the highest point, it will become zero.

Detailed explanation-2: -A pendulum reaches its maximum velocity when the block is at its lowest point (the pendulum is vertical and pointing straight down). We can then use the expression for conservation of energy to determine the maximum height of the block.

Detailed explanation-3: -Both acceleration and velocity of the bob are zero when it reaches its extreme position during the oscillation. 4. The amplitude of oscillation of the simple pendulum decreases with time.

Detailed explanation-4: -At its highest point (Point A) the pendulum is momentarily motionless. All of the energy in the pendulum is gravitational potential energy and there is no kinetic energy. At the lowest point (Point D) the pendulum has its greatest speed.

Detailed explanation-5: -The radial position is constant and the radial velocity is zero. The radial acceleration is the centripetal acceleration; maximum at the low point of the swing and zero at the top of the swing.

There is 1 question to complete.