Unit 3: Impulse and Momentum Flashcards
Momentum (p)
a quantity defined as defined as the product of mass and velocity of an object
inertia in motion
mass in motion
Impulse (J)
the net external force acting on a system for a period of time
produces a change in momentum
Impulse-Momentum Theorem
a small force acting for a long time can produce the same change in momentum as a large force acting for a short time
impact time
how long the impact time lasts (NOT the time from drop to rest)
Newton’s 3rd Law
If two objects interact the magnitude of the force exerted on object 1 by object 2 is equal to the magnitude of the force simultaneously exerted on object 2 by object 1 and these forces are opposite in direction.
Big Idea!
a small force acting for a long time can produce the same change in momentum as a large force acting for a short time.
extending the time interval over which of force is applied allows a smaller force to cause a greater change in momentum than if a short time
momentum (p) units
kgm/s
impulse (J) unit
kgm/s
Law of Conservation of Momentum
for any isolated system, the total momentum of all objects interacting with one another remains constant regardless of the nature of forces between the objects
total P initial = total P final
Perfectly Inelastic
The 2 objects stick togther after the collision so that tehir final velocities are the same
ex: Bugs on a windshield, meteorite colliding head on with earth
Inelastic
The two objects to form during the collision so that the total kinetic energy decreases but the object moves separately after the collision
ex: car crash
*total kinetic energy
Elastic
The two objects bounce after the collision so that they move separately trade momentums
ex: golf club and ball
Which type of collision conserves Kinetic Energy
Elastic
Separation
When 2 objects, initially together, separate and opposite direction
ex: push chair away from table, throw ball
Perfectly Inelastic Equation
m1v1i + m2v2i = (m1+m2)vf
