A constatnt force F is applied on a body of mass m for time interval t because of this force the velocity of body chnges from Vi to V. Then the changes in momentum during the interval 𐤃t will be?
Correct answer: C. m(vf-vi)/Δ t
- A. 1/2m( vf2 -vi2 )
- B. Δt/ma
- C. m(vf-vi)/Δ t
- D. Mass
Explanation
According to Newton's 2nd law F=ma Putting a= vf-vi/∆t F= m(vf-vi)/∆t Solving this ahead F=mvf-mvi /∆t we know Momentum = mv So mvf = final momentum mvi = initial momentum mvf-mvi = change in momentum mvf-mvi /∆t = change in momentum in interval ∆t
This question appeared on the ETEA MDCAT 2005 paper, which you can sit online with every answer explained.
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About Linear Momentum
Linear momentum is the vector product of mass and velocity, p = mv, and changes when a net external force acts. Work includes impulse as the change in momentum, conservation of momentum in isolated systems, collisions and explosions, and the distinction between elastic, inelastic and perfectly inelastic collisions.
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