Impulse and Momentum Honors Physics Science Stater List

Impulse and Momentum Honors Physics

Science Stater List all the kinds of physics you see in this video http: //www. youtube. com/watch? v=QFcj. TM 57 ENk

Momentum is what Newton called the “quantity of motion” of an object.

Momentum The momentum of an object: Depends on the object’s mass. Momentum is directly proportional to mass. Depends on the object’s velocity. Momentum is directly proportional to velocity.

Momentum In symbols: p = mv p m v

Momentum is a vector quantity. Common units of momentum: kg m/s

Impulse The impulse exerted on an object depends on: The force acting on the object. Impulse is directly proportional to force. The time that the force acts. Impulse is directly proportional to time.

Impulse In symbols: I = Ft I F t

Impulse is a vector quantity. Common units of impulse: N s

Impulse & Momentum The impulse exerted on an object equals the object’s change in momentum.

Impulse & Momentum In symbols: I = Dp

Conservation of Momentum Since impulse = change in momentum, If no impulse is exerted on an object, the momentum of the object will not change.

Conservation of Momentum no external forces act on a system, the total momentum of the system will not change. If Such a system is called an “isolated system”.

Conservation of Momentum is conserved in system. every isolated

Conservation of Momentum Another way to think about it is: Internal forces can never change the total momentum of a system.

Conservation of Momentum In practice, for any event in an isolated system: Momentumafter = Momentumbefore

Impulse = Momentum Consider Newton’s 2 nd Law and the definition of acceleration Ns Units of Impulse: Kg x m/s Units of Momentum: Momentum is defined as “Inertia in Motion”

Impulse – Momentum Theorem IMPULSE CHANGE IN MOMENTUM This theorem reveals some interesting relationships such as the INVERSE relationship between FORCE and TIME

Impulse – Momentum Relationships

Impulse – Momentum Relationships Constant Since TIME is directly related to the VELOCITY when the force and mass are constant, the LONGER the cannonball is in the barrel the greater the velocity. Also, you could say that the force acts over a larger displacement, thus there is more WORK. The work done on the cannonball turns into kinetic energy.

Momentum is conserved! The Law of Conservation of Momentum: “In the absence of an external force (gravity, friction), the total momentum before the collision is equal to the total momentum after the collision. ”

Try it! Go to http: //www. physicsclassroom. com/class/momentum/L esson-1/Momentum-and-Impulse-Connection Take notes (if you need to) and try to answer the questions on the page Then go to, http: //www. physicsclassroom. com/calcpad/1 dkin/probl ems Complete these problems & use guided solutions only if you need help