Newton ’ s Third Law  for every action force, there is an equal and opposite reaction force.  Forces always occur in action-reaction pairs. Action-reaction.

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Presentation transcript:

Newton ’ s Third Law  for every action force, there is an equal and opposite reaction force.  Forces always occur in action-reaction pairs. Action-reaction force pairs are  equal in size  opposite in direction. Chapter 11

Action and Reaction Forces  Force pairs do not act on the same object.  Equal forces don’t always have equal effects. Example: action force of Earth pulling on an object and causing it to fall is much more obvious than the equal and opposite reaction force of the falling object pulling on Earth. Chapter 11

Momentum  quantity defined as product of mass and velocity of an object.  momentum = mass  velocity  p = mv  Moving objects have momentum. more mass,greater momentum Faster object moving, greater its momentum When you force an object to change its motion, you force it to change its momentum. Chapter 11

Momentum Calculate the momentum of a 6.00 kg bowling ball moving at 10.0 m/s down the alley toward the pins. GIVEN: p = ? m= 6.00 kg v = 10 m/s WORK : p = mv p = (6.00 kg) (10 m/s) p = 60 kg x m/s down the alley m p v

Momentum A 135 kg ostrich running north at 16.2 m/s. Calculate the momentum. GIVEN: p = ? m= 135 kg v = 16.2 m/s WORK : p = mv p = (135 kg) (16.2 m/s) p = 2190 kg x m/s north m p v

Momentum Calculate the velocity of a 0.8 kg kitten with a momentum of 5 kg x m/s forward. GIVEN: p = 5 kg x m/s forward m= 0.8 kg v = ? WORK : v = p/m v = 5 kg x m/s / 0.8 kg v = 6.3 m/s forward m p v

Law of Conservation of Momentum total amount of momentum in an isolated system is conserved (stays same). When moving object hits second object, some or all of momentum of first object is transferred to second object. rocket propulsion. Cars collided Billiards Chapter 11