# AP Physics with Hansenator - Momentum Lesson

### Momentum

- Conservation of Momentum problems are situational. It depends on the number of objects. For example, if two objects collide and stick together they become one object with combined mass, the equation:

### Example 1

Two cars travelling in opposite directions crash. Car 1 travelling left at 25 m/s with mass 2400 kg and Car 2 travelling right at 15 m/s with mass 1800 kg.

(a) If the cars stick together, what is their final speed?

(b) If Car 1 bounces back at 5 m/s, what is the final speed of car two and in which direction?

### Where does the impulse equation come from?

### Example 2

A 2000 kg car is travelling at 20 m/s and stops moving over a 10 second period. What was the magnitude of the average breaking force?

### Example 3

A mass of 2 kg is moving at a speed of 10 m/s along a horizontal, frictionless surface. It collides, and sticks, with a 3 kg mass moving in the same direction at 5 m/s.

What is the final velocity of the system after the collision?

What percentage of kinetic energy is lost in the collision?

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reyajahmedrazu (51)7 years agoi appreciate your work. thanks for giving us wonderful solution my dear friend. @hansenator

hansenator (57)7 years agoThank you reyajahmedrazu! Haven't heard from you in a while. I hope to post some more SAT challenges for everyone!

khurshid (57)7 years agoFriend @hansenator, you have many amazing quality people. We found great pleasure in seeing your post. Because something new is available at your post. So I'm very happy to see your post. I can learn more. ,,, i wait your next post my dear friend @hansenator

divid (33)7 years agoi agree your comment ....

hansenator (57)7 years agoI am glad to refresh your memory of physics. The next post is out! Java programming!

khurshid (57)7 years agoI know . I really miss you your beautiful post...

Thnx for coming steemit...

I wait your next post...

I wish you a beautiful weekend...

raja34 (43)7 years agoWow very helpful post friend.

I am new so suport me

hansenator (57)7 years agoHey raja34. Thank you for your comment! I will see what I can do!

mehedi108 (51)7 years agowonderful post.

hansenator (57)7 years agoThank you!!! More to come!

abirhasan63 (44)7 years agogreat math

@abirhasan63

hansenator (57)7 years agoThanks abirhasan63!

uncommonriad (73)7 years agoThis is very learning post for me. Thank you so much for share.

hansenator (57)7 years agoLearning is muy bien mi amigo! Best wishes to you! More to come!

shakilkhan (73)7 years agoMany nice posts. Everyone can learn a lot from your post. Thank you

hansenator (57)7 years agoI hope to teach thousands more with anything I can make up (or borrow haha)! See you soon shakilkhan!

divid (33)7 years agoYour presentations of friends are excellent. I liked a lot.

i am new so please follow me . i follow you everyday must

hansenator (57)7 years agoHaha. Thank you divid. If you keep up with me and post well I will follow you!

kamchore (70)7 years ago@hansenator beautiful way to teach momentum lesson by example. Thaks for sharing. keep sharing:)

hansenator (57)7 years agoThank you kamchore! There is much beauty in physics!

rigor (56)7 years agoChallenging lesson but, Sat math is more challenging!

hansenator (57)7 years agoGlad to hear from you rigor! I will try to get some more SAT questions for you soon!