1 - Momentum and Impulse Flashcards
1
Q
Define momentum of a body of mass moving with velocity.
A
mv.
2
Q
What are the units of momentum?
A
kgms^-1 or Ns.
3
Q
Define impulse.
A
Ft.
4
Q
What is the impulse-momentum principle?
A
I = mv-mu (sub v=u+at into F=ma).
5
Q
What happens in terms of impulse when two bodies collide?
A
Equal/opposite force and in contact for same time so equal magnitude but opposite directions.
6
Q
Define the principle of conservation of momentum.
A
Total before = total after.
m1u1 + m2u2 = m1v1 + m2v2
7
Q
How do you solve problems involving collisions?
A
.Draw diagram - velocity arrows.
.Impulse arrows if needed.
.Choose a positive direction and apply principles.
