Question

The change of motion of a body is proportional to the applied force, and it takes place in the direction of a straight line in which that force is applied. This describes what law of motion?

Answer 1

Answer:

Newton's Second Law of Motion  

Explanation:

According to Newton's second law of motion, the change in velocity of a body is directly proportional to the force applied on it. Velocity is a vector quantity. It measures the magnitude of the speed as well as its direction.

F = m a

where, F is the applied force, m is the mass and a is the acceleration.

It can also be expressed as:

$F = \frac{dp}{dt}$

where, p = mv ( momentum)

Answer 2

Answer:

Newton's second law

Explanation:

Momentum is defined as the measurement of motion in the object.

So, the change in motion means the change in momentum of the body.

According to newton's second law, the force acting on an object is directly proportional to the rate of change of momentum of the object.

So, it describes the Newton's second law.