U5 - Momentum and Impulse Flashcards
Can you run from momentum?
No
What is the momentum equation
P = mv
What unit is momentum in
( kg x m ) / s
What is the Newton’s second law with momentum?
∑F = 𝚫P/𝚫T —– ∑F = mv_f - mv_i /𝚫T
What force does momentum measure?
The force during a collision
What is Impulse?
Impulse = 𝚫P Impulse = ∑F𝚫T
What regulates the amount of force in collisions?
The time that the collision takes.
What is impulse approximation?
It is the idea that in short time collisions, the force of impact will be much larger than the other forces.
During an impact is Fn = Impact force? T or F
True
Should you wear a helmet?
Yes
What is conservation of momentum
The idea the momentum is conserved during collisions and explosions
What is the conservation of momentum equation
∑p_i = ∑p_f
What is an inelastic collision
An inelastic collision is a collision where kinetic energy is not conserved due to deformation of shape that turns KE into thermal energy (Ball of clay hitting the ground)
What is an elastic collision
A collision that conserves kinetic energy and has a bounce off of two objects. (note: hard spheres are used as examples of elastic collisions, while in reality being inelastic)
What is a perfectly inelastic collision
A collision that has one object stick to the other
