# Physics A2 Level

The flashcards below were created by user koolcookie11 on FreezingBlue Flashcards.

1. Force
• needed to change the velocity of an object
• rate of change of momentum
2. Momentum
• mass x an objects velocity
• units: kgms-1
• vector quantity
• p=mv
3. Newton's Laws of Motion
• First: an object remains at rest or in uniform motion unless acted on by a force
• Second: the rate of change of momentum of an object is proportional to the resultant force on it
• Third: when objects interact they exert equal and opposite forces on each other
4. Impulse
5. Force-time graphs
• the area under the line of a force-time graph represents the change of momentum or the impulse of the force
6. Principle of Conservation of Momentum
• For a system of interacting objects, the total momentum remains constant, provided no external forces acts on the system
• mBvB + mAvA = mAuA + mBuB
• (mB + mA)V = mAuA + mBuB
7. Elastic and Inelastic Collisions
• Elastic: one where there is no loss of kinetic energy, e.g. bouncy ball
• Totally Inelastic: one where the colliding objects stick together, e.g. car crash
• Partially Inelastic: one where the colliding objects move apart and have less kinetic energy after the collision than before
8. Explosions
• mBvB = -mAvA
• move apart in opposite directions
 Author: koolcookie11 ID: 106626 Card Set: Physics A2 Level Updated: 2011-12-15 10:18:22 Tags: physics alevel force momentum Folders: Description: Force and Momentum Show Answers: