The second law can also be written as force equals
Correct answer: A. the rate of change of momentum
- A. the rate of change of momentum
- B. momentum multiplied by time
- C. mass divided by acceleration
- D. work divided by distance only
Explanation
F equals ma is the special case of this for constant mass; the momentum form is more general and handles situations such as a rocket losing mass as it burns fuel. It also leads directly to the impulse momentum theorem, that force multiplied by time equals change in momentum. That is why a longer collision time means a smaller force.
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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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