Conseving momentum Flashcards
what is Newton’s third law of motion?
when two objects interact, they exert equal and opposite forces on eachother
How does this law apply to a jet engine?
exerts a force on hot gas in the engine to expel the gas
the gas being expelled exerts an equal and opposite force on the engine
What conditions must be met for this law to be true?
forces must be the same type
acting on different object
What is the principle of conservation of momentum?
states that for a system of interacting objects, the total momentum remains constant, provided no external resultant force acts on the system
total final momentum = total initial momentum
When two object collide, what happens to the change of momentum of one of the object?
exert equal and opposite forces on eachother
so the change of momentum of one object is equal and opposite to the change of momentum of the other object
How can conservation of momentum be tested?
motion sensor linked to a computer
mass of each trolley measured
push trolley A into B so they stick together
computer displays velocity of troller
How are these results used?
velocity before collision and velocity after collision is measured
mu = mv + mv
When would a collision produce no momentum after the collision?
when two objects collide with equal and oppisite momentum - head on collision
+ velocity and - velocity
