In physics, momentum is how much 'oomph' something has when it's moving! It depends on both its mass and velocity. A tiny pebble thrown super fast can have the same momentum as a bowling ball rolling slowly! Collisions are when things bump into each other, and momentum is usually conserved (meaning the total momentum before the collision equals the total momentum after), as long as there are no external forces acting. This principle helps us predict how objects will move after they collide.
Understanding momentum and collisions helps us analyze everything from car crashes to billiard ball impacts. We use formulas to calculate momentum ($p = mv$, where $p$ is momentum, $m$ is mass, and $v$ is velocity) and apply the law of conservation of momentum in various scenarios.
Match the term with its correct definition:
| Term | Definition |
|---|---|
| Momentum | A. A collision where kinetic energy is not conserved. |
| Elastic Collision | B. The property of a moving object that makes it hard to stop. |
| Inelastic Collision | C. A collision where kinetic energy is conserved. |
| Impulse | D. The product of the force and the time interval during which it acts. |
| Conservation of Momentum | E. The total momentum of an isolated system remains constant. |
Complete the paragraph with the correct words:
The law of ____________ states that the total momentum of a closed system remains constant if no external ____________ act on the system. In a perfectly ____________ collision, both momentum and kinetic energy are conserved. However, in a ____________ collision, only momentum is conserved.
Explain, using the concepts of momentum and impulse, why airbags are effective in protecting people during car accidents.
Please log in to post your answer.
Log InEarn 2 Points for answering. If your answer is selected as the best, you'll get +20 Points! 🚀