Yet Another Car Collision
A small mass tends to experiences a larger this after a collision?
What is acceleration/velocity/speed?
In terms of vectors and scalars, "p" is this.
What is a vector?
Mass, speed, displacement, and time, to name a few.
What are scalars?
Unlike an elastic collision between two objects, this would be the final mass in an inelastic collision between two objects.
What is both masses combined (m1 + m2)?
Like mass and energy, this is always conserved during a collision.
What is momentum?
This equation represents the definition of acceleration.
What is v/t (change in velocity over time)?
If an object initially has a positive momentum, and after a collision it has a negative momentum, it would mean this happened to it.
What is change directions?
If a force is experienced over a longer period of time on an object, this would definitely increase.
What is impulse? (J)
Time in the impulse equation, represents how the ______ changes the _______.
What is the duration the force changes the momentum/impulse?
QUICK CALCULATION
A 1000kg car is traveling to the right when it collides head-on with a 3000kg truck traveling 10 m/s to the left. BAM!
After which the collision causes both vehicles to stop.
This is how fast (speed) the car must have been traveling.
What is 30 m/s?
A doubling of the amount of force experienced by an object, in twice as much time would do this to it's change in momentum.
What is 4x? (quadruple)
Two objects colliding inelastically, with equal mass, and equal but opposite velocities, would experience this final momentum.
What is 0? (none)
Cars have an innate safety feature called the "crumple zone". Unlike earlier models of car that were rigid and heavy, with an almost immediate end to the collision, newer cars are lighter and absorb the impact of a collision by crumpling around the frame.
The crumple zone on a car works well because of these two factors that change the impulse of the collision.
[also state how they change]
What are decrease the force of impact and increase the time of impact?
DAILY DOUBLE
Two object are falling to the Earth, neglecting drag and friction. Object 1 has twice the mass of Object 2. They are both going to land on identical platforms, and break through them (collide with them). However, due to the mass of Object 1, it breaks through in half the time as Object 2.
This would be an accurate comparison of their changes in momentum.
m*[(Vf-Vi)/t]*t
Is a longer way of writing out the equation for this.
[Hint, find the units and solve]
What is Impulse? (J)