Study Notes
Momentum is a measure of the motion of an object and is calculated as the product of its mass and velocity. It is a vector quantity, meaning it has both magnitude and direction.
- Momentum — the product of an object's mass and velocity. Example: A car moving at a certain speed has momentum.
- Conservation of Momentum — in a closed system, the total momentum before and after a collision is the same. Example: Two ice skaters pushing off each other will have equal and opposite momentum.
- Impulse — the change in momentum, equal to the force applied times the time it is applied. Example: A bat hitting a ball applies an impulse to change the ball's momentum.
Exam Tips
Key Definitions to Remember
- Momentum is mass times velocity.
- Conservation of momentum states total momentum is constant in a closed system.
- Impulse is the change in momentum.
Common Confusions
- Confusing momentum with force.
- Forgetting that momentum is a vector and has direction.
Typical Exam Questions
- What is momentum? Momentum is the product of mass and velocity.
- How is momentum conserved in a collision? The total momentum before the collision equals the total momentum after.
- What is impulse? Impulse is the change in momentum, calculated as force times time.
What Examiners Usually Test
- Understanding of momentum conservation in collisions.
- Ability to calculate momentum and impulse.
- Application of momentum concepts to real-world scenarios.