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In Newtonian mechanics, momentum (pl.: momenta or momentums; more specifically linear momentum or translational momentum) is the product of the mass and velocity of an object. It is a vector quantity, possessing a magnitude and a direction.
The conservation of momentum (mass × velocity) and kinetic energy (1 / 2 × mass × velocity 2) can be used to find the resulting velocities for two colliding perfectly elastic objects. These two equations are used to determine the resulting velocities of the two objects.
Momentum (N⋅s) Explanation 0.42 2.4 1 A 420-gram (15 oz) football (FIFA specified weight for outdoor size 5) kicked to a speed of 8.6 km/h (5.3 mph). 0.42 38 16 The momentum of the famous football kick of the Brazilian player Roberto Carlos in the match against France in 1997. The football had a speed of 137 km/h (85 mph), making it one of ...
Conservation of momentum requires m b v b = m t v t. Solving for the target's velocity gives v t = m b v b / m t = 0.016 kg × 360 m/s / 77 kg = 0.07 m/s = 0.17 mph. This shows the target, with its great mass, barely moves at all. This is despite ignoring drag forces, which would in reality cause the bullet to lose energy and momentum in flight.
Momentum is conservative: any change in momentum of an object requires an equal and opposite change of some other objects. Hence the recoil: imparting momentum to the projectile requires imparting opposite momentum to the gun. A change in momentum of a mass requires applying a force (this is Newton's laws of motion).
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The moment of force, or torque, is a first moment: =, or, more generally, .; Similarly, angular momentum is the 1st moment of momentum: =.Momentum itself is not a moment.; The electric dipole moment is also a 1st moment: = for two opposite point charges or () for a distributed charge with charge density ().
Young adults are taking the supercommute into work, a trend that will only likely continue as return-to-office mandates from Amazon, JP Morgan, and others continue.. Molly Hopkins, age 30, has ...