# Shared Flashcard Set

## Details

Unit 4
Momentum
22
Physics
11/01/2012

Term
 What is momentum associated with?
Definition
 Moving things
Term
 What is the equation for momentum when direction is important?
Definition
 Momentum=(mass)(velocity)
Term
 What is the equation for momentum when direction is not important?
Definition
 Momentum=(mass)(speed)
Term
 What would cause a large momentum?
Definition
 1) Large mass2) Large velocity3) Both
Term
 Even if an object has an enormous mass, if the velocity is zero, the momentum is ______________________.
Definition
 Zero
Term
 If you have a higher momentum, you would have a harder time ________________________________.
Definition
 Changing direction/stopping it
Term
 What is Inertia and its important factors in comparison with momentum?
Definition
 works for moving objects, and resting ones, and only depends on mass.
Term
 What is momentum's important factors in comparison with inertia?
Definition
 Works only on moving objects, and requires both mass and velocity
Term
 Momentum changes when ___________, ____________, or _____________ changes
Definition
 a)massb)velocityc)both
Term
 To change momentum, an ____________________ is required.
Definition
 Unbalenced force
Term
 What is an impulse?
Definition
 considers amount of force exerted and how long it is exerted for. Changes momentum.
Term
 What is the equation for impulse?
Definition
 Impulse=(force)(time)
Term
 To change an object's momentum as much as possible, apply _________________________.
Definition
 A large force for a large time
Term
 An impulse must be exerted by something _________________ to the object.
Definition
 External
Term
 If a gun is fired...
Definition
 a) The gun pushes on the bulletb) The bullet pushes on the gun with equal and opposite forcesc) Therefore, the forces produce equal and opposite impulses - Equal and opposite changes in momentum
Term
 Momentum is a __________________.
Definition
 Vector quantity
Term
 Momentum is always ___________________.
Definition
 Conserved
Term
 Momentum is _________________________.
Definition
 Always conserved in a collision.
Term
 What is the equation for change in momentum?
Definition
 [NET (MASS)(VELOCITY)]before=[NET (MASS)(VELOCITY)]after
Term
 What is an elastic collision?
Definition
 No deformation or heat generation occurs
Term
 What is an inelastic collision?
Definition
 deformation and/or heat generation occurs
Term
 If you run into a brick wall and a haystack, at a constant momentum both times which will hurt more and why?
Definition
 The brick wall because the time for the haystack would be longer because you would slowly sink in, there for the force would be smaller. The time for the brick wall would clearly have an abrupt stop, so the force of the brick wall would be very high.
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