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# MomentumBy Roni Rountree

What is Momentum?  Momentum describes how strong an object is moving.  An object that isn't moving has no momentum.  The law of conversation of momentum describes what happens to momentum when two objects collide.  Momentum's formula is p=(m)(v) meaning momentum equals mass times velocity.  The "p" in the formula stands for "petere," which means go towards in Latin.  A motorcycle could have more momentum than a van if the motorcycle was moving a lot faster than the van.  A sticky collision is when an object collides with another object with the same mass and the two objects stick together.  A non-sticky collision is when two objects with the same mass collide, but just trade velvelocities rather than stick together.

This is an elastic collision.

The golf club striking the golf ball is an example of an elastic collision because the ball bounces off of the club.

This is an example of an inelastic collision

The New York Giants defensive end tackling Tony Romo is an example of an inelastic collision because the two players do not bounce off of each other.

If you were to drop a clay ball on the ground that would be an example of an inelastic collision.  When the clay ball would hit the floor, it would lose its energy to heat and sound.  Angular momentum is when an object keeps spinning in circles rather than moving in a straight line.  In space, stars, black holes, nebulae, and planets all have angular momentum because they spin in circles.