Question

The SI unit of Impulse is ?

1. kg-ms^-2
2. kg-ms^-1
3. ms^-2
4. Nm² kg^-2

Answer 1

Correct Answer - Option 2 : kg-ms^-1

The correct answer is kg-ms^-1.

• An Impulse is a large force acting on a body for a short time to produce a finite change in momentum.
• Impulse = Force x time interval 
• The product of the mass of a body and its velocity is called the momentum of the body.
• The SI unit is N-s or kg-m/s.
• It has the same unit as momentum.
• Example of Impulse: In catching a ball, a player by drawing his hands backward increases the time of contact.

• Force is a push or pull that changes or tends to change the state of rest or of uniform motion, the direction of motion, or the shape and size of a body.
  • The SI unit of Force is kg-ms^-2. 
• Acceleration is the rate of change of the velocity of an object with respect to time.
  • The SI unit of acceleration is ms^-2.
• The constant G which appears in the equation for Newton's law of gravitation is called the Gravitational constant.
  • The Si unit of the Gravitational constant is Nm²kg^-2.
  • Newton's Gravitational constant: F = G (m₁m₂) /  r²