Momentum
Calculate the momentum of a .2 Kg mass traveling at 12 m/s to the right.
2.4 Kg m/s
How is impulse increased?
Extend the time of the force of impact
An object, initially travelling at 5 m/s, experiences a change in momentum of 25 Ns. What is the impulse on the object?
Impulse is the same as change in momentum. It experiences an impulse of 25 Ns.
Two people run towards each other. One person is twice the mass of the other. They jump and collide mid-air. The initial momentum of the pair was 400 Kg m/s. What will the final momentum be before they hit the ground?
The same as the initial. The momentum is conserved. 400 Kg m/s
2 cars are approaching an intersection. The 1200 Kg car is moving at 10 m/s to the east and the 1400 Kg car is moving at 20 m/s to the north. How much total momentum do the cars have?
40,000 Kg m/s
What is the name of Utah Professional Hockey team?
Utah Mammoth
Which has more momentum, a 1 Kg feather going 8 m/s or a .2 Kg feather going 45 m/s?
The .2Kg feather
If you double the impulse on an object how will its change in momentum change?
It will double.
A 2 Kg object feels a force of 5 N for 10 s. What is the change in momentum of the object?
50 Ns
If the time of impact in a collision is extended by four times, how much does the force of impact changes.
decreases by a factor of 4 or ¼th
A single object is moving and strikes a second stationary object. If the objects have 10 Ns of momentum before the collisions, what can you conclude about the final momentum of the objects?
They will 10 Ns of momentum
Which of the following weighs the most: an average adult bicycle, a cubic foot of water, an adult deer, or all of the air in this room?
All of the air in this room
Bicycle (40 lbs), A cubic foot of water (62 lbs), An adult deer (150 lbs), Air (390 lbs).
Calculate the momentum of a 2 Kg object moving at 5 m/s to the left
-10 Kg m/s
Two eggs of the same mass are dropped from the same height. One egg is caught in a bed of cotton. The other eggs is allowed to hit the ground. Which egg is more likely to break and why (reference the impulse-momentum theorem)
The egg that hits the ground. The change in momentum of the eggs are the same. The time of impact is much shorter for the egg that hits the ground and so the average force is much higher.
Which object will experience the greatest impulse one that experiences bouncing or one that doesn't?
bouncing
Why do gymnast use floor mats that are very thick?
Extra thickness extends time of momentum change and reduces the force
Will a large truck always have more momentum than a skateboard?
No
In what decade was North Sevier High School built?
1980s
A 4 Kg mass is moving at 3 m/s. What mass needs to move at 10 m/s to have the same momentum as the 4Kg mass?
1.2 Kg
During a car crash a seatbelt is designed to stretch a little bit. Why do engineers design the seatbelts this way in terms of the impulse-momentum theorem?
The longer you allow the seatbelt to apply a force the lower the average force will be. By letting the seatbelt stretch a little elongates the time and reduces the force on your chest.
A .5 Kg object is traveling at 4 m/s. A 1 kg object collides with and sticks to the 0.5 kg object. What is the velocity after the collision?
1.33 m/s
Why would it be a poor idea to have the back of your hand up against the outfield wall when you catch a long fly ball.
Less time to change the momentum
Ball A has a mass of 1.0 kg and a speed of 9.0 m/s. Ball B has a mass 1.2 kg and a speed of 8.5 m/s. Which ball has the most momentum?
Ball B
More than half of the breathable oxygen in the world come from here
Ocean
Mass A has a momentum of 10 Kg m/s. Mass B has a momentum of 20 Kg m/s. Mass B is twice the mass of mass A. How is it possible for mass A and mass B to have the same momentum.
Mass A has double the velocity
You want to close an open door by throwing either a 400-g lump of clay or a 400-g rubber ball toward it. You can throw either object with the same speed, but they are different in that the rubber ball bounces off the door while the clay just sticks to the door. Which projectile will apply the larger impulse to the door and be more likely to close it?
The bouncy ball. It not only loses all of its initial momentum it gains momentum in the opposite direction. This results in a larger momentum change and so a larger impulse.
Is momentum conserved for colliding objects that are moving at angles to one another?
Yes
Why are cars designed to crumple on impact.
To extend the time for a change in momentum
Ball A has a mass of 1.0 kg and a speed of 9.0 m/s. Ball B has a mass 1.2 kg and a speed of 8.5 m/s. Which ball would need the greatest impulse to bring the speed to 0 m/s?
Ball B
What is the name of the largest desert in the world?
Antarctic Polar Desert