O-LevelPhysicsForces5054/11 · May/June 2023 · Q101 Mark
A constant frictional force acts on a moving object for a short amount of time causing the momentum of the object to decrease. Which expression is used to calculate the time for which the force acts?
Atime = change in momentum / force
Btime = change in momentum × force
Ctime = momentum / force
Dtime = momentum × force
✓ Correct answer
A: time = change in momentum / force
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