Revise later
SpaceTo flip
If confident
All Flashcards
What is the effect of a force acting on an object over a period of time?
It causes a change in the object's momentum (impulse).
What happens to the total momentum in a closed system?
The total momentum remains constant (conservation of momentum).
What is the effect of expelling fuel with speed $v$ at rate $\frac{\Delta m}{\Delta t}$ on a rocket?
The rocket experiences a thrust force.
Define momentum.
Momentum ($\vec{p}$) is a measure of how much 'oomph' an object has in its motion. It's the product of an object's mass (m) and its velocity ($\vec{v}$): $\vec{p} = m\vec{v}$
What is impulse?
Impulse ($\vec{J}$) is the change in momentum of an object. It's also the product of the average force ($\vec{F}_{avg}$) acting on an object and the time interval ($\Delta t$) during which the force acts: $\vec{J} = \vec{F}_{avg} \Delta t = \Delta \vec{p}$
What are the units for momentum?
kg⋅m/s
What are the units for impulse?
N⋅s (which is equivalent to kg⋅m/s)
What is linear momentum?
Momentum for objects moving in a straight line.
What is angular momentum?
Momentum for rotating objects.
What is the effect of applying a force over a time interval?
It causes an impulse, which results in a change in momentum of the object.
What happens to the total momentum in a closed system?
The total momentum remains constant (conservation of momentum).
What happens when fuel is expelled from a rocket?
The rocket experiences a thrust force in the opposite direction.