Sarah Chillag & Tiffany Ikhile
A sudden strong and unreflective urge or desire to act; the change of momentum
The reason an impulse is greater when an object bounces than when the same object comes to a sudden stop is because the impulse required to bring an object to a stop and then throw it back again is greater than the impulse required to just bring it to a stop.
Law of Conservation of Momentum
The principle that the total linear momentum of a closed system remains constant, unless an EXTERNAL force is applied
force times the time equals the mass times the change in velocity
since we know force • time is impulse and since the quantity m•v is momentum, the quantity m•Δv must be change in momentum so the equation really says....
Impulse = Change in momentum
Your friend says that the law of momentum conservation is violated when a ball rolls down a hill and gains momentum. What do you say?
The Law of Momentum Conservation states that if no external forces act on a system, then the system’s momentum will not change. If you treat the ball as your system, it is clear that the gravitational force is acting on the ball, provides an impulse, and therefore changes the ball’s momentum. But this is not a violation.