A 2.0-kg object is at rest on a perfectly frictionless...

A 2.0-kg object is at rest on a perfectly frictionless surface when it is hit by a 3.0-kg object moving at $8.0 \mathrm{m} / \mathrm{s}$ If the two objects are stuck together after the collision, what is the speed of the combination?

Labs

Want to see this concept in action?

NEW

Explore this concept interactively to see how it behaves as you change inputs.

View Labs

Key Concepts

Conservation of Momentum

The conservation of momentum is a fundamental principle in physics which states that in a closed system with no external forces, the total momentum remains constant. This principle is crucial in analyzing collisions, as it allows for the determination of the final velocity of objects after an impact by equating the total momentum before and after the event.

Perfectly Inelastic Collisions

A perfectly inelastic collision occurs when colliding objects stick together after the collision, moving as a single object. In these collisions, while kinetic energy is not conserved due to energy losses (often as heat or deformation), the total system momentum is conserved, and the final velocity can be found by dividing the combined momentum by the total mass.

Frictionless Surface

A frictionless surface is an idealization where no frictional forces act against the motion of objects. This condition simplifies the analysis of collisions by ensuring that external forces (other than the collision forces) do not affect the momentum of the system, thereby validating the direct application of momentum conservation principles.

Transcript

Please give Ace some feedback