1 / 23

Section 1: Momentum and Impulse

This video covers the concepts of momentum, impulse, and impact force in physics. It also includes sample problems and demonstrations to help understand these concepts better.

bane
Download Presentation

Section 1: Momentum and Impulse

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Section 1: Momentum and Impulse

  2. Intro Video: http://www.cleanvideosearch.com/media/action/yt/watch?videoId=D3T8aXRZEQA

  3. Just a few Q’s • What is your understanding of momentum? • What factors cause an object to have momentum? • If an object has momentum, what does that tell you about it?

  4. Momentum: Momentum is like inertia in motion. Momentum = Mass x Velocity Or p = mv Problem: A 200kg snowball travels with a velocity of 2 m/s. Find its momentum: Question: Would momentum be a vector or scalar quantity and why?

  5. Impact Force: Force to create a change in momentum

  6. Balloon Toss Demo: Get a partner and fill one balloon. Referrals to those who throw them at each other. 

  7. Impulse: Change in momentum Derivation: When objects are stopped slowly….. When objects are stopped quickly….. (Demo: Desk Jump)

  8. F·t = mVf - mVi Impulse is the change in momentum1) Increasing the _______& ______ of the impact2) Increasing the change in ___________.

  9. https://www.youtube.com/watch?v=ozAG8t8_4M4

  10. Sample Problem 1: Find the following for a .5kg baseball when colliding with a wall and coming to a stop from 10m/s. • Impulse b) Force to stop in .1s

  11. Sample Problem 2: Find the following for the .5kg ball: a) Change in momentum b) Impulse c) Find the force if the moment of impact was .5s

  12. Compression of a golf ball

  13. Turbines

  14. Reduce the impact force, so don’t forget to wear your helmet!

  15. Warm-up: Find the Impulse for Each Situation. The mass of the car is 1000kg

  16. Warm-up: A cannon fires a 250kg projectile at 30m/s. If the force exerted by the cannon is 3,000N, find the following: • Find the initial momentum before firing: • Find the final momentum when the velocity is 300m/s: • Find the change in momentum (impulse): 4) Find the time the force is applied:

  17. Warm up: A 2.5 kg ball strikes a wall with a velocity of 7.5 m/s and bounces back with a velocity of 5 m/s. If ball is in contact with the wall for .25s, find the force on the ball.

  18. Quiz (10 pts): The following graph shows the force vs time the impact of a bat hitting a .4 kg ball. Use this information to find the following: • Change in momentum. • Final velocity of ball if it is initially at rest.

  19. Momentum Quiz: (4 points each) A car that has a mass of 2,000 kg is initially traveling at 20 m/s when it hits an oncoming truck traveling at 40 m/s. If the car rebounds backwards off of the truck with a speed of 10 m/s, find the following: • Initial momentum of the car: b) Final momentum of the car: c) Impulse (change in momentum) of the car: d) Force of contact if the collision time is .0021 seconds.

  20. Warm up: Find the total momentum before and after the collision.

  21. Extreme Egg Drop Lab Objective: Drop 3 eggs from 300 feet that survive. Rules: No dimension can be larger than 30 inch, max weight 5 lbs, no fluids or jells allowed, & max of 2 students per group. Grading: No eggs break- 30/30 1 egg breaks – 25/30 2 eggs break – 20/30 3 eggs break – 15 /30

More Related