Conservation
What does it mean to conserve something?
we keep the same amount of it
A shelf is pushed with a force of 50 N for 3 seconds. What is the impulse on the shelf?
150 kg m/s
A 1000 kg elephant is sunbathing (at rest). What is its momentum?
0 kg m/s
Two students run into each other in the hallway and bounce apart. What kind of collision is this?
Elastic
What are the units for Momentum?
kg m/s
A desk is sliding across a classroom and is stopped by friction. Was momentum conserved?
No, there was a net force in the form of friction
What is the change in momentum on a desk that is pushed with a force of 20 N for 3 seconds?
60 kg m/s
A 2 kg baseball is traveling at 60 m/s. What is its momentum?
120 kg m/s
A football player tackling another player is this type of collision.
What is inelastic?
What is the unit for velocity?
m/s
If momentum is conserved in a situation (like a collision), what is the total change in momentum?
Delta p = 0 kg m/s
A 1 kg baseball starting at rest is accelerated to a speed of 40 m/s in 0.5 seconds. What was the size of the net force on the ball?
80 N
A boat with a momentum of 300 kg m/s has a mass of 1500 kg. How fast is the boat going?
0.2 m/s
If the total momentum before a collision is 150 kg m/s, what do you know about the total momentum after the collision?
It is also 150 kg m/s
The chance of a snow day tomorrow.
What is 0%?
Is momentum of a system ALWAYS conserved?
No, not when there is a NET FORCE (impulse)
A chair with a mass of 5 kg starts at rest and is accelerated to a speed of 20 m/s with a force of 50 N. How long was the force pushing for?
2 seconds
Roofer the dog is running at 12 m/s and has a momentum of 600 kg m/s. What is Roofer's mass?
50 kg
A 400 kg paddle boat collides head-on with a 200 kg raft that started at rest. If the boats stick together and continue on with a velocity of 5 m/s, how fast was the 400 kg paddle boat going before the collision?
7.5 m/s
How do you make an elephant float?
Two scoops of elephant one scoop of vanilla
A piece of clay at rest is exploded into THREE pieces. The first piece of clay has a momentum of -10 kg m/s. The second piece has a momentum of 2 kg m/s. What is the momentum of the third piece?
8 kg m/s
A 5 kg box starting at rest is pushed with a force of 10 N. Friction pushes the box back with a force of 8 N. How fast is the box going after 10 seconds?
4 m/s
Monica (50 kg) and Oscar (60 kg) are jogging. Monica has a momentum of 100 kg m/s. What is Oscar's momentum?
120 kg m/s
Juan and Carla are ice skating toward each other. Juan has a mass of 70 kg and is skating at 2 m/s. How fast must 60 kg Katherine be going so that when they meet in the center of the rink, they will stop?
-2.3 m/s
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