Momentum
If Bob’s mass is 120kg and he runs at 11m/s, what is his momentum
1320Ns
How do airbags help decrease the force experienced by a passenger?
Airbags increase the time over which the collision occurs (mΔv = FΔt). Increase “t” ⇒ decrease “F”
How is an elastic collision different from an inelastic collision?
Elastic collision conserves momentum and conserves energy of the system. Inelastic collision only conserves momentum
Correct order of the planets (closest to farthest)
Mercury, Venus, Earth, Mars,
Jupiter, Saturn, Uranus, Neptune
What does "Ma" in Mr. Ma's name mean in Chinese?
Horse
What units would (energy) / (momentum) be in?
N-m / N-s = m/s
A 800kg car increased from 10m/s to 30m/s in 2.80 seconds
What’s the impulse?
(800kg)(20m/s)
16,000Ns
What condition do you need for a perfectly inelastic collision?
The colliding objects must stick with each other
This force causes the gas and dust cloud to condense into a spinning, flattened disk.
Gravity
What does "Torres" mean in Spanish?
Towers
(Bull is Toro)
A 5kg ball experiences a force of 10N for 20 seconds. What is the change in velocity?
mΔv = FΔt
5(Δv)= (10)(20)
Δv = 40 m/s
Which celebrity hosts Impaulsive? (Just name one)
Logan Paul
(Mike Majlak and George Janko)
A 2kg yellow ball traveling at 3m/s to the right, hits a 1kg red ball traveling at 4m/s to the left. After a perfectly elastic collision, the yellow ball travels 1.667m/s to the left. What is the final velocity of the red ball?
(2)(3) + (1)(-4) = (2)(-1.667) + (1)(v)
2 = (-3.333) + 1(v)
v = 5.333m/s to the right
This process involves the gradual clumping together of dust and small particles to form larger bodies, eventually leading to the creation of planets.
Accretion
What number was our old classroom at the beginning of the year?
4215
Which has more momentum, a walking elephant or a nerf dart? Show your approximate calculation w your answer
Elephant: (5000kg)(1m/s) = 5000Ns
Nerf dart: (0.02kg) (25m/s) =0.5Ns
A 1500kg car wants to go from 0m/s to 100m/s in 5 seconds. How much force must be applied?
mΔv = FΔt
(1500) (100) = (F) (5)
30,000 N
Two fish collide head-on in a perfectly inelastic collision.
Big Fish has a mass = 5 kg and a vi = 4m/s to the right.
Smol Fish has a mass = 1 kg and a vi = 8m/s to the left
What is the decrease in the KE during the collision?
(5)(4) + (1)(-8) = MV
12 = (6)v
V = 2 m/s to the right
Old KE = (0.5)(5)42 + (0.5)(1)82 = 72
New KE = (0.5)(6)22 = 12
Decrease in KE = 60J
Put in chronological order
a) Nebula exists as dust and gas cloud
b) Accretion
c) Heavy Bombardment
d) Frost line forms
e) Nebula collapses due to gravity
A > E > D > B > C
Nebula exists. Then collapses. Frost lineee. Accretion. Then heavy bombardment!
How many chairs are in this classroom?
37-39 (I think answer is 38 on the dot)
A man on a bicycle, together, they have a momentum of 750 Ns. The bicycle is 50kg, going 6m/s. What is the man’s mass?
mtotalv = p
(50 + m)(6) = 750
50 + m = 125
m = 75kg
You slap 1kg of clay onto the ground. It hits the ground at 10m/s with a force of 20N. What is the time it takes to come to rest?
(1)(10) = (20) t
t = 0.5 seconds
Floating in space, the 50kg astronaut throws a 10kg canister away from the spaceship at 20m/s. What is the velocity of the astronaut after the throw?
p1 = -p2
(10kg)(20m/s) = (50kg)(v)
V = 4m/s toward the spaceship
What phenomenon caused the outer planets to be more gaseous and the inner planets to be more terrestrial?
Temperature gradient / frost line / snow line
Also would accept “gravity pulling heavier elements in”
How many students do we have in this class?
P1: 32
P2: 33