Impulse of a force is defined as the product of the force and the time interval for which the force acts.
Impulse (I) = Force (F) × Time (t)
Impulse is equal to the change in momentum of a body.
According to Newton’s second law:
Impulse = Change in momentum
I = m(v − u)
The SI unit of impulse is newton-second (N s).
Impulse is a vector quantity. Its direction is the same as the direction of the applied force.
For a fixed change in momentum, increasing the time of impact reduces the force applied.
Q1. Impulse of a force is equal to: A) Force / time B) Force × time C) Momentum / time D) Mass × acceleration Answer: B Q2. Impulse is equal to the change in: A) Velocity B) Mass C) Momentum D) Energy Answer: C Q3. SI unit of impulse is: A) Newton B) Joule C) Newton second D) kg m s⁻² Answer: C Q4. Impulse is a: A) Scalar quantity B) Vector quantity C) Dimensionless quantity D) Constant quantity Answer: B Q5. A cricketer pulls his hands backward while catching a ball to: A) Increase force B) Increase momentum C) Increase time of impact D) Decrease time of impact Answer: C Q6. Which of the following reduces the force during impact? A) Decreasing time B) Increasing time C) Increasing mass D) Increasing velocity Answer: B Q7. Impulse depends on: A) Force only B) Time only C) Force and time D) Mass only Answer: C Q8. Airbags in cars are used to: A) Increase impact force B) Reduce change in momentum C) Increase time of collision D) Stop motion instantly Answer: C
Impulse is the product of force and the time for which it acts.
Impulse (I) = F × t = Change in momentum
SI unit of impulse is newton second (N s).
Impulse is a vector quantity.
Impulse is equal to the change in momentum of a body.
Direct MCQs are asked on impulse formula, unit, relation with momentum and real-life applications.
