Momentum Flashcards
What is an isolated system?
A system which contains no external unbalanced forces.
Is total energy conserved in an isolated system?
Yes.
Is kinetic energy conserved in an isolated system?
It doesn’t have to be.
What are the units for Newtons?
N = kg(m/s²)
What are the units for Joules?
J = N(m) = kg(m²/s²)
What are the units for power?
W = J/s = kg(m²/s³)
During an elastic collision, the kinetic energy before = _____.
The kinetic energy after.
What is momentum?
(mass)(velocity)
Is momentum a vector or scalar?
Vector
What are the units of momentum?
Any mass velocity combo.
What is impulse?
The change in momentum.
What is Newton’s first law of motion?
Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.
What is Newton’s second law of motion?
The relationship between an object’s mass m, its acceleration a, and the applied force F is F = ma. Acceleration and force are vectors (as indicated by their symbols being displayed in slant bold font); in this law the direction of the force vector is the same as the direction of the acceleration vector.
What is Newton’s third law of motion?
For every action there is an equal and opposite reaction.
What is impulse measured in?
N(s) = kg(m/s)
What is the area under a force time graph?
The impulse acting on an object.
FΔt = mΔv will only work if _____ remain constant.
Force and mass
What is centre of mass?
Where we assume an objects mass to be.
What happens to an object that is struck at its centre of mass?
It accelerates without rotating.
In an isolated system, ∑momentum before = _______.
∑momentum after.
What the three basic types of collisions?
Hit and stick, hit and bounce, and explosion/recoil.
