Question

SI unit of momentum is -

1. kilogram - metre per second
2. gram - centimetre per second
3. Newton - metre per second
4. Joule - metre per second

Answer 1

Correct Answer - Option 1 : kilogram - metre per second

The correct answer is kilogram - meter per second.

• SI unit of momentum is kilogram - meter per second.
  • The units of momentum will be the product of the units of mass and velocity.
  • Mass is measured in kg and velocity in ms-1.
  • Therefore, the SI unit of momentum will be kgm/s.

• Newton - meter per second:
•  when force is equivalent to the rate of change of momentum -
  •  Force=(change in momentum)/(time interval) then, change in momentum = Force x (time interval).
  • Therefore, the unit for momentum can be Newton-second (Ns)
• Gram - centimetre per second:
  •  If the mass is in grams and the velocity in centimetres per second, then the unit of momentum will be gram-centimetres per second (g⋅cm/s).
• Joule - metre per second:
  • The joule-second is a unit of action or of angular momentum.
  • The joule-second (symbol J⋅s.) is the product of an SI derived unit, the joule (J), and an SI base unit, the second (s).