Buscar
Estás en modo de exploración. debe iniciar sesión para usar MEMORY

   Inicia sesión para empezar

level: Momentum + Moments

Questions and Answers List

level questions: Momentum + Moments

QuestionAnswer
Define momentumMomentum is the product of mass and velocity of an object
Whats the equation for impulseForce x Change in time = change in (mass x velocity)
What can be said about momentum where no external forces actMomentum is always conserved Momentum before an event is equal to the momentum after
Whats is impulseChange in momentum
Whats the area under a force-time graph equal toChange in momentum = Impulse
State some car saftey features, explain what they are Then explain how these help car saftey and explain how our understanding of momentum has helped usCrumple zones, which crumple upon impact Seat belts which stretch upon an impact Air bags all of which increases the impact time of the car or the passenger This causes the force exerted on passengers to decrease meaning they are less likely to be seriously injured As Force = (change in (mass x velocity)) / change in time So longer time means less force
State the principle of momentsWhen a body is equilbrium Sum of anticlockwise moments = clockwise moments About the same point
For a moment question If the object which is applying a force isnt described as a particle, but rather as being a set distance in length What must be done to this before calulating the momentHalf the length of the force applying object
State what is meant by the centre of mass of an objectPoint at which all the objects mass acts
Define a couplea pair of equal and opposite coplanar forces
Define the moment of a coupleforce × perpendicular distance between the lines of action of the forces
Define coplanar forcesForces on the same plane
Whats the unit for momentumkg⋅m/s
Whats the unit for momentsNm
Whats the equation for momentum?= mass x velocity