Question

4. Qualitative definition of force is given by Newton's first law of motion.

5. Kg m/s2

is the unit of force.

6. Rate of change of displacement with time is known as acceleration.

7. According to the second law of motion for every action there is an equal and

opposite reaction.( this are true false answer all)​

Answer 1

Answer:

The tendency of undisturbed objects to stay at rest or to keep moving with the same velocity is called inertia. This is why, the first law of motion is also known are the law of inertia. Here, the state of an object is changed only when an external force acts on it. This it provides a qualitative definition of force

Force is defined as the rate of change of momentum. For an unchanging mass, this is equivalent to mass x acceleration. So, 1 N = 1 kg m s-2, or 1 kg m/s2.

Velocity: The rate of change of displacement of an object (displacement over elapsed time) is velocity. Velocity is a vector since it has both magnitude (called speed) and direction.

The size of the force on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object. Forces always come in pairs - equal and opposite action-reaction force pair