Force And Momentum Flashcards
What is Newtons Second Law?
The acceleration of an object in a given direction is proportional to the resultant force on it. f=ma
What is Newton’s First Law?
An object will remain at rest or continue at a constant velocity unless acted upon by a resultant force.
What is Newtons Third Law?
Every force has a reaction force that is equal in magnitude and opposite in direction.
What is impulse and how is it caused?
Impulse is the change in momentum over time. dMV = Fdt
To cause a certain impulse (change in momentum) you must apply a large force for a short period of time or a small force for a long period of time.
What is an elastic collision?
All KINETIC energy is conserved.
What is an Inelastic collision?
Totally inelastic: both objects stick together.
What is a partially elastic collision?
Objects have less kinetic energy than before the collision.
What is the principle of conservation of momentum?
Total momentum before collision = total momentum after collision.
Use momentum frames to calculate conservation of momentum questions.
MV before and MV after.
What is a zero momentum frame?
What happens to the velocities of two objects that collide in a zero momentum frame?
If you travel alongside a moving object and it appears stationary to you, it is a zero momentum frame. A two body collision in a zmf: the two velocities are simply reflected.
What does the area represent on a Force/Time graph?
Impulse
change in momentum
Newtons laws, what is force in terms of momentum?
Force is the rate of change of momentum.
What is the equation that represents the weighted velocity for a zmf?
V(zmf) = (M1V1 + M2V2) / (M1 + M2)
