# GENERAL KNOWLEDGE

## GK

### PHYSICS

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What is the correct formula to find the resultant force?
 A change in momentum/ time B change in velocity/time C change in mass/ time D None of the above
Explanation:

Detailed explanation-1: -F net = p t, F net = p t, where Fnet is the net external force, p p is the change in momentum, and t t is the change in time.

Detailed explanation-2: -Force (F) is equal to the change in momentum (P) over the change in time (t). And the change in momentum (P) is also equal to the impulse (J). Impulse has the same units as momentum (kg*m/s or N*s).

Detailed explanation-3: -The result of the force acting for the given amount of time is that the object’s mass either speeds up or slows down (or changes direction). The impulse experienced by the object equals the change in momentum of the object. In equation form, F • t = m • v.

Detailed explanation-4: - p = m v = m ( v f − v i ) . In this example, the velocity just after impact and the change in time are given; thus, oncep is calculated, Fnet=pt F net = p t can be used to find the force. To determine the change in momentum, substitute the values for the initial and final velocities into the equation above.

There is 1 question to complete.