In order to change the momentum of an objective there must be:
Correct answer: A. A force applied
- A. A force applied
- B. A change in time
- C. A change in distance
- D. A change in temperature
Explanation
Fact. According to Newton's second law of motion, force is the rate of change of momentum i.e: F = d p/dt And hence a force acting for a given amount of time will change an object's momentum. Put another way, an unbalanced force always accelerates an object - either speeding it up or slowing it down.
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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