Momentum and impulse

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Summary presentation for grade 12 physics momentum and impulse

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Momentum and impulse

  1. 1. 1 Everything Science www.everythingscience.co.za 2. Momentum and Impulse Physics Grade 12
  2. 2. 2 Everything Science www.everythingscience.co.za Revision – Newton's laws Newton’s Second Law: The resultant force acting on a body will cause the body to accelerate in the direction of the resultant force The acceleration of the body is directly proportional to the magnitude of the resultant force and inversely proportional to the mass of the object. Newton’s Third Law: If body A exerts a force on body B then body B will exert an equal but opposite force on body A.
  3. 3. 3 Everything Science www.everythingscience.co.za Momentum The linear momentum of a particle (object) is a vector quantity equal to the product of the mass of the particle (object) and its velocity. Momentum and Newton's second law The net or resultant force acting on an object is equal to the rate of change of momentum. ⃗p=m⃗v ⃗Fnet= Δ ⃗p Δt
  4. 4. 4 Everything Science www.everythingscience.co.za Conservation of momentum A system is a physical configuration of particles and or objects that we study. An isolated system is a physical configuration of particles and or objects that we study that doesn’t exchange any matter with its surroundings and is not subject to any force whose source is external to the system. Principle of conservation of linear momentum: ‘The total linear momentum of an isolated system is constant’ or ‘In an isolated system the total momentum before a collision (or explosion) is equal to the total momentum after the collision (or explosion)’. ⃗pT= ⃗p1+ ⃗p2+ ⃗p3+ … + ⃗pn
  5. 5. 5 Everything Science www.everythingscience.co.za Collisions Elastic collision: both total momentum and total kinetic energy are conserved. Inelastic collision: only total momentum is conserved, total kinetic energy is not conserved.
  6. 6. 6 Everything Science www.everythingscience.co.za Impulse Impulse is the product of the net force and the time interval for which the force acts. Impulse-momentum theorem Impulse-momentum theorem: the impulse is equal to the change in momentum. Impulse= ⃗Fnet⋅Δ t Impulse=Δ⃗p
  7. 7. 7 Everything Science www.everythingscience.co.za For more practice see: everythingscience.co.za Shortcode: ESCJT

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