# Momentum

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- Created by: annagabrielle
- Created on: 29-03-16 11:34

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- Momentum
- p=mv
- p is momentum (kgms-1)
- m is mass (kg)
- v is velocity (ms-1)

- Newtons laws
- 1st: an object remains at rest or at a constant velocity unless acted on by an external force
- in a vacuum, no friction or gravity

- 2nd: the rate of change of momentum of an object is proportional to the resultant force acting upon it
- F=ma
- F is force (kgms-2)
- m is mass (kg)
- a is acceleration (ms-2)

- ?p= m?v
- F= ?p/t
- Impulse = F ?t = ?p

- F=ma
- 3rd: for every actions, there is an equal and opposite reaction
- Conservation
- total momentum of a system must remain constant
- provided no external forced act upon it

- m(a)v(a) + m(b)v(b) = 0
- therefore, m(b)v(b) = - m(a)v(a)

- total momentum of a system must remain constant

- Conservation

- 1st: an object remains at rest or at a constant velocity unless acted on by an external force
- Impact forces
- F=mv/t
- momentum / contact time
- rebound impacts ?p = (-mv) -(mu)

- momentum / contact time
- F= mv-mu / t

- F=mv/t
- Conservation
- total momentum of a system must remain constant
- provided no external forced act upon it

- m(a)v(a) + m(b)v(b) = 0
- therefore, m(b)v(b) = - m(a)v(a)

- total momentum of a system must remain constant
- Elastic and Inelastic Collisions
- Perfectly Elastic
- all momentum conserved
- all Ek conserved
- relative speed of approach = relative speed of separation

- Perfectly Inelastic
- momentum conserved
- Ek not conserved
- Things stick together

- General Inelastic
- momentum conserved
- Ek not conserved
- no ability to comment on afterwards speed unless calculation done

- Perfectly Elastic
- Explosions
- recoil with equal and opposite momentum
- use of conservation of momentum

- p=mv

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