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level: Collisions, explosions and impulse

Questions and Answers List

level questions: Collisions, explosions and impulse

QuestionAnswer
What is momentumthe product of a moving objects mass and velocity
what is the formula for momentump=mv where p is momentum in kgms-1 m is mass in kg v is velocity in ms'1
what type of quantity is momentum?vector
what is the law of conservation of momentum?when two objects collide the total momentum before the collision is equal to the total momentum after the collision in the absence of external forces.
what is an inelastic collisiona collision in which kinetic energy is lost
what is an elastic collision?a collision in which kinetic energy is conserved (kinetic energy is the same before and after the collision)
what is the formula for kinetic energy?ek=1/2mv^2 where ek is kinetic energy in joules m is mass in kg v is velocity in metres per second
what is an explosiona collision where the momentum before and after is 0
what is impulsethe change in momentum (the product of average force and time of contact for a collision)
what is the formula for impulseimpulse = Ft where impulse is measured in Newton seconds (Ns) f is force in Netwons t is time in seconds
what kind of graph is thisforce time graph often the force changes during a collision so calculations involve the average force
what is the area under a force time graph equal toimpulse
what happens when you increase time of contact for any collision with a fixed change in momentum?the peak/average force is reduced
what formula do you use when doing calculations involving momentum of two objectsm1u1 + m2u2 = m1V1 + m2V2
how can you figure out by experiment if a collision is elasticrecord mass of each vehicle and speed of each vehicle before and after collision use ek=1/2mv^2 to calculate the total kinetic energy before and after the collision if kinetic eenrgy is the same before and after, the collision is elastic