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...Gce physics unit dynamics nd force newton s law tells us that the is equal to rate of conservation momentum a push or pull which can change an objects states vector motion first object will sum momenta bodies in system stays continue with constant velocity remain stationary even if forces act between provided there no resultant acting on it therefore external means total accelerating changing direction before interaction must be unbalanced where defined according this equation after rd p mv consider example n body exerts b exert and as written colliding opposite for teacher has weight follows gravitational earth pulling so also towards free diagrams remember may multiple most situations are many one time trying you calculate by adding vectors see kg m draw diagram every acceleration quantity including pairs become green ball very cluttered unclear help avoid separating drawing each independently above box slope we separate them look at separately friction v contact inelastic collision ...