NCERT Class-9 Science Solutions: Chapter 9-Force And Laws Of Motion Part 4

Download PDF of This Page (Size: 183K)

Question 19:

Derive the unit of force using the second law of motion. A force of produces an acceleration of on a mass and an acceleration of on a mass . What acceleration would the same force provide if both the masses are tied together?


This unit is also called newton. Its symbol is N.

Acceleration produced in M,

Question 20:

What is momentum? Write its SI unit. Interpret force in terms of momentum. Represent the following graphically


SI unit of momentum is

Force = Rate of change in momentum

Momentum versus velocity when mass is fixed

Momentum versus mass when velocity is constant

Image Momentum - velocity graph

Image Momentum - Velocity Graph

Image Momentum - velocity graph

Developed by: