Momentum

Momentum is defined as the product of the mass of an object and its velocity
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Time: 10 minutes
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Momentum Definition

Momentum is defined as

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The SI unit of momentum is kg.m/s

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Change in momentum equation

Ft = m(v1 - v0)

  1. Left term Ft is called (1) transparent
  2. Right term m(v1 - v0) is called (2) transparent
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impulse
change in momentum
change in velocity
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The units of change in momentum equation

Ft = m(v1 - v0)

The units for the right side of the equation are kilogram.meter/second (or kg.m/s)

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The units on the two sides are equivalent in the change of momentum equation

Ft = m(v1 - v0)

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What happens when you have a collision in your car

Your body experiences a change in momentum, for while you are moving you have some momentum, but after the collision you have (1) transparent .  Since impulse is equal to the change in momentum, the force exerted on your body to stop it depends on the time during which that force acts.  If you are not wearing seat belts and have no airbag, your head may continue forward until it is stopped quickly by the windshield.  The equation tells us that if the time (t) is small, the force (F) will be (2) transparent .  Seat belts and airbags increase the time a person decelerates, reducing the force exerted on the person.

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Why it hurts less if you let your hand "give" with a hard-thrown ball when you catch it

In order to change the ball's momentum to zero, a certain amount of impulse is necessary.  If the time during which the ball is stopped is longer, the force will be less.

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