Momentum
Calculating Momentum
Momentum Conservation
Momentum Change
Collisions
100
Momentum = Mass x _________
velocity
100
What is the momentum of a 60-kg halfback moving eastward at 9 m/s.
540 kg•m/s, east
100
Which of Newton's Laws does this represent?
Newton's 3rd Law
100
________ is a change in momentum.
impulse
100
An 3000 kg car traveling west at 17 m/s and hits a 8000 kg truck traveling at 15 m/s east. After impact the two entangle. This is an example of an ______.
inelastic collision
200
The momentum equation shows that momentum increases or decreases according to an object's mass increasing.
Increases
200
Momentum of a 1000-kg car moving northward at 20 m/s.
20 000 kg•m/s, north
200
True/False
For any collision occurring in an isolated system, momentum is conserved.
true
200
Which case has the greatest velocity change?
Case B
The velocity changes from +30 m/s to -28 m/s. This is a change of 58 m/s (-) and is greater than in case A (-15 m/s).
200
A boy riding on a skateboard rolls over a big rock and gets thrown off. How does this example demonstrate the Law of Conservation of Energy?
this is an explosion
300
True/False
An object's momentum is indirectly proportional to an object's velocity
false
300
A car possesses 20 000 units of momentum. What would be the car's new momentum if the velocity doubled?
40,000 units of momentum
300
A large truck collides with a small bicycle.
Which vehicle experiences the greatest force of impact?
both have the same
300
Which case has the biggest momentum change?
case B,
momentum change depends on velocity change
300
A 50 kg woman is docking her 150 kg sailboat. As she gets off, her velocity is 2 m/s. What is the final velocity of the sailboat?
-0.67 m/s
400
The metric unit for momentum is ____________
kg x m/s
400
A car possesses 20 000 units of momentum. What would be the car's new momentum if its mass was doubled (by adding more passengers),
40,000 units of momentum
400
A large truck collides with a small bicycle.
Which vehicle experiences the largest impulse?
both have the same impulse
400
Which case has the greatest acceleration change?
case A
400
An 3000 kg car traveling west at 17 m/s and hits a 8000 kg truck traveling at 15 m/s east. After impact the two entangle. What is their final velocity? What direction are they going?
6.27 m/s East
500
Momentum is a ______________ quantity with both magnitude and direction.
vector
500
A 60 kg quarterback is running at 3 m/s down the field.
A 90 kg halfback is running at 2 m/s down the field.
Which player has the most momentum?
neither, both players have the same momentum.
500
A large truck collides with a small bicycle.
Which vehicle experiences the largest acceleration?
The bicycle
F1=F2
F=ma
Bicycle's mass is smaller so acceleration must be greater
500
Which case has the greatest impulse?
Case A
impulse = momentum change, which depends on velocity change and velocity change is greatest in case A
500
A 4 kg object going 7 m/s to the right collides with a 8 kg object going 9 m/s to the left. After colliding the 4 kg object goes 6 m/s to the left. What is the final velocity of the 8 kg object?
final velocity = -2.5 m/s