physics - momentum

momentum

mass in motion; product of mass and velocity

vector quantity

is momentum a scalar or vector quantity?

impulse

a product of force over a certain amount of time; produces a change in momentum

p = mv

what is the equation for momentum?

I = Ft

what is the equation for impulse?

kg * m/s

what is the unit for momentum?

impulse

on a force vs. time graph, the area under the curve is a measure of ___

true

a speeding bicycle can have the same momentum as a pickup truck (true/false)

increased

to produce a specific change in momentum, the time must be ___ to reduce the force (increased, decreased, zero)

Ns

what is the unit for impulse?

impulse-momentum theorem

impulse is the change in momentum

angular momentum

the product of the object’s mass and velocity and the distance from the center of rotation; this has no torque (twisting); it’s traveling at a constant momentum

closed/isolated system

nothing can go in or go out; no external force

internal and external

what are the two forces?

internal force

happen within the system

external force

happens outside the system

elastic collision

start apart → end apart

inelastic collision

start apart → end together

explosive collision

start together → end apart

m₁vi₁ + m₂vi₂ = m₁vf₁ + m₂vf₂

what is the equation for an elastic collision?

m₁vi₁ + m₂vi₂ = (m₁ + m₂) vf

what is the equation for an inelastic collision?

(m₁ + m₂) vi = m₁vi₁ + m₂vi₂

what is the equation for an explosive collision?

impulse

the quantity Ft is called ___

kg * m/s

the unit of momentum is ___

mass and velocity (mv)

momentum is the product of an object’s ______

impulse

the change in momentum for an object is equal to and caused by the ___ given to the object

lost

any gain in momentum by an object occurs only by the ___ of a corresponding amount of momentum by another object

conserved

in a system consisting of objects upon which no external force is acting, the momentum of the system is ___

zero

two objects of equal mass approach each other head on with the same speed. the total momentum of the system before the collision takes place equals ___

internal

a(n) ___ force cannot change the momentum of the system

direction

because momentum has both magnitude and ___, momentum is a vector quantity

negative

if the momentum of a cannon is considered positive after it fires a shell, the shell’s momentum is considered ___

20

a moving object containing a bomb explodes. if the object had a total of 20 units of momentum before the explosion, its pieces would have a total of ___ units of momentum just after the explosion