Chapter 11 Lesson 2

By Matthew Trollson

Momentum

Momentum is the combination of an objects mass and speed. Total momentum does not change when two objects collide. Scientists call this the conservation of momentum. Example: A baseball and tennis ball are thrown at the same speed and distance. The baseball would have more momentum because it has more mass.

Newton's Laws of Motion

Weightlessness

The state of weightlessness is feeling like not having any weight. It would be measured as 0 pounds (or any other measurement of weight). Skydivers feel weightless because of an upward force, called air resistance.