Momentum
Momentum is described as...
mass in motion
What is the equation for change in momentum
(delta)p= m*(delta)v
What is impulse?
Change in p
Name the three types of collisions we learned about this past week
Perfectly inelastic, inelastic, elastic
Which gas makes up about 78% of the Earth's atmosphere?
Nitrogen
What are the units of momentum
kgm/s
What is the variable used to express "change"
delta(triangle)
What is the variable for impulse?
delta p
Explosions are examples of what type of collision?
Inelastic
What is the largest organ of the human body?
The skin
What type of quantity is momentum?
Vector quantity
When calculating "change in momentum" what is the variable that is changing.
Velocity or time
What is the relationship between impulse and momentum?
Impulse is the change in momentum
Name 2 ways KE is dissipated in an inelastic collision
Sound, crumple, heat, friction
What type of fruit is radioactive?
Bananas
Math: A 3 kg cat, riding a 2 kg skateboard, is travelling 5 m/s. What is the momentum of the system?
25 kgm/s
What are the TWO units of change in momentum.
Ns, kgm/s
When you catch a water balloon, you bend your elbows. How does this affect the force you and the water balloon experience?
Increases time= decrease force
What happens to the velocities of equally sized objects when they collide elastically.
They SWITCH
What planet in our solar system has the most moons?
Jupiter
If two astronauts push off of each other in space, what happens to their total momentum?
Stays at zero- they are moving in opposite directions
What object has a greater CHANGE in momentum...
a) a car slowing from 10 m/s to 0 m/s
b) a car travelling 10 m/s, bouncing off of a wall, and traveling 5m/s in the opposite direction
B
MATH: When pushing a box, a person exerts a force of 10N over a period of 5 seconds. Calculate the impulse.
50 Ns
Two boxes, each traveling opposite directions, collide elastically. What is the change in kinetic energy?
Zero! kinetic energy is conserved
What is the only letter that doesn't appear on the periodic table?
J