Further Mechanics Revision notes for unit 4 physics revision 2.0 / 5 based on 3 ratings ? PhysicsForcesA2/A-level Created by: Kirsty JonesCreated on: 09-06-10 13:39 Force is the rate of change of momentum Force is needed to change the velocity of an object Momentum = mass * velocity = kg ms-1 vector quantity Greater an objects momentum, the more force is needed to stop it. 1N is the resultant force needed to cause a rate of change of momentum of 1kg ms-1 1 of 4 Newton's Second law the rate of change of momentum of an object is proportional to the resultant force on it resultant force is proportional to the change of momentum per second F=(m(v-u))/t =ma 2 of 4 Newton's First law An object remains at rest or with constant motion unless acted on by a force momentum is constant 3 of 4 Area under force time group Represents change in momentum (impulse) Area = F * difference in time impulse produced during time intervals. 4 of 4
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