Concepts
Momentum
Impulse
Collisions
Tectonic Plates
100
What is the equation for momentum?
p=mv
100
If you decrease the velocity does the momentum increase or decrease?
decrease of momentum
100
Impulse has several equations. For every correct one you list you get 100 points, for every incorrect one you list, you lose 100 points.
impulse= Δp
impulse = mΔp
impulse=Ft
Ft=mΔv
100
What is conserved in a collision?
Momentum
100
What do we feel when tectonic plates move and collide?
earthquakes
200
Define the units for momentum and impulse.
kgm/s or Ns
200
A person carrying groceries doubles their velocity but halves their mass when her groceries fall to the floor. What happened to their momentum?
Their momentum is the same.
200
What does impulse mean?
It's the change in momentum
200
What type of collision is sticky?
inelastic
200
What kind of tectonic plate boundary does compression stress?
Convergent boundary
300
Which has greater momentum: a train at rest or a skateboard going 100 mph?
The skateboard since the train has no velocity and p=mv it would have no momentum.
300
Determine the momentum of a 1000-kg car moving at 20 m/s.
p = m*v
p = 1000 kg*20 m/s
p = 20 000 kg•m/s
300
If a 2N force is applied on an object for 10 seconds what is the Impulse
Δp = Ft
Δp =(2)(10)
Δp =20 kgm/s
300
This cannon gives the cannonball has 480 kgm/s of momentum. How much momentum does the cannon get?
-480 kgm/s
300
What are the three types of tectonic plate boundaries (you get 100 points for every correct answer)
Convergent
Divergent
Transform
400
List some examples of an ellastic collision.
basketball bouncing
pool
tennis
400
The fastest recorded baseball pitch was clocked at 45.0 m/s. Determine the momentum of a 0.145-kg baseball.
p = m*v
p = 0.145 kg*45.0 m/s
p = 6.52 kg•m/s
400
What is the change in momentum of of 1kg object with an initial velocity of 2 m/s and a final velocity of 7m/s?
First p = mΔv= 2kgm/s
Second p = mΔv = 7 kgm/s
Δp = 5 kgm/s
400
Before the collision, the pink ball has 20 kgm/s of momentum and the green ball has 80 kgm/s of momentum. How much momentum do they have after the collision?
20 + 80 = 100 kgm/s
400
200 points: What kind of tectonic plate boundary 200 points: What type of stress is it?
Transform Boundary
Shear stress
500
Why doesn't an egg break when thrown on a sheet?
more impact time = less impact force
500
If you increase the momentum does the mass or velocity increase?
either
500
A 3kg object slows from 62m/s to rest in 20 seconds. What force does it feel?
Ft = mΔv
F(20) = (3)(-62)
F = -186/20
F = -9.3 N
500
A shark with a mass of 500 kg is moving at 5m/s to when it eats a 4kg fish moving -50 m/s. What is the shark's velocity after he eats it?
BEFORE: Shark momentum = 2500 kgm/s
Fish momentum = -200 kgm/s
AFTER: Total momentum = 2300 kgm/s
P = mv
2300 = 504v
v= 4.56 m/s
500
What type of tectonic plate boundary created this?
Divergent