4327464
Description
Flashcards by Fabian Coles, updated more than 1 year ago
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Created by Fabian Coles
over 8 years ago
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| Question | Answer |
| What is momentum? | Anything that moves has momentum. The amount of momentum that an object has depends on how fast it is moving, and the mass of the object. |
| What is the word/letter equation for momentum? | momentum = mass x velocity p = m x v |
| What is the Law of Conservation of Momentum? | The law of conservation of momentum states that the total momentum of a closed system does not change. This means that when two objects collide the total momentum of the objects before the collision is the same as the total momentum of the objects after the collision. |
| What does Closed System mean? | It mean that only the forces of the two objects colliding affects the motion of the objects. If another force (called an external force) affects the motion of the objects then the momentum is not conserved, it will change. |
| What is the total momentum? | Total momentum means the momentum of object 1 plus the momentum of object 2. |
| What are the units of momentum? | kgm/s - "kilogram metres per second". |
| What is an elastic collision? | It is when two objects collide together and bounce off of each other. It is when no energy is lost to heat |
| What is an inelastic collision? | When two objects collide together and stick together. Like dropping something to the ground, as long as it doesn't bounce up to the same hight as you dropped it. |
| What can we predict from the law of conversation of momentum about elastic or inelastic collisions? | that the total momentum of the objects before the collision is the same as the total momentum of the objects after the collision. |
| What is a Crumple Zone? | The car is designed so that the structure of the car will give way during a collision. The metal of the car will dent, bend and fold during a collision which increases the amount of time it takes the car to stop.The parts of the car that do this (the front and the back) are called crumple zones. |
| How do Seatbelts work? | The seatbelt prevents the person being thrown about in the car. The seatbelt also stretches a little, while restraining the person during a crash. The stretching increases the amount of time it takes the person to stop. |
| How do air bags work? | An air bag will give way a little when a person hits it and this gives an extra increase to the amount of time it takes the person to stop. |
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