Question

In the opening scenes of the prelecture video, we outlined some of the key properties of momentum. Which of the following statements are consistent with these properties?

1) Momentum is a vector quantity.
2) Momentum is conserved in an isolated system.
3) The momentum of an object depends on its mass and velocity.
4) Momentum is always conserved in collisions.
5) Momentum is measured in kilograms per second.

Answer 1

Key properties of momentum include it being a vector quantity, conserved in an isolated system, and dependent on mass and velocity, but measured in kg·m/s instead of kg/s.

Step-by-step explanation:

The key properties of momentum explained in the prelecture video can be summarized with the following points:

1. Momentum is a vector quantity, which means it has both magnitude and direction, and is therefore expressed in terms of components.
2. Momentum is conserved in an isolated system, meaning the total momentum remains constant when no external forces act on the system.
3. The momentum of an object depends on its mass and velocity; specifically, momentum increases with greater mass or higher velocity.
4. Momentum is typically conserved in collisions unless external forces act on the system.
5. Momentum is measured in kilogram meters per second (kg·m/s), not kilograms per second.

Based on the information provided and the properties of momentum, statements 1), 2), and 3) are consistent with the described properties of momentum.

Statement 4) is also correct, provided that no external forces are involved. However, statement 5) is incorrect since momentum is measured in kg·m/s rather than kg/s.