1 / 13

Momentum & Collisions

Momentum & Collisions. Physics - Chapter 6. Momentum. Vector quantity Product of an objects mass and velocity Represented by p SI units of kg x m/s Momentum is what makes it hard to stop an object rolling down a hill P = m x v.

leigh-woodard
Download Presentation

Momentum & Collisions

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. Momentum & Collisions Physics - Chapter 6

  2. Momentum • Vector quantity • Product of an objects mass and velocity • Represented by p • SI units of kg x m/s • Momentum is what makes it hard to stop an object rolling down a hill • P = m x v

  3. A 2250 kg pickup truck has a velocity of 25 m/s to the east. What is the momentum of the truck?

  4. Changes in momentum • A force applied for a certain time will cause a change in momentum • Impulse-momentum theorem FΔt = Δp or FΔt = Δp = mvf - mvi

  5. A 1400 kg car moving westward with a velocity of 15 m/s collides with a utility pole and is brought to rest in 0.30 s. Find the force exerted on the car during the collision.

  6. A 2240 kg car traveling to the west slows down uniformly from 20.0 m/s to 5.00 m/s. How long does it take the car to decelerate if the force on the car is 8410 N to the east?

  7. Law of Conservation of Momentum • The total momentum of all objects interacting with one another remains constant. • In equation form: m1v1,i+m2v2,i = m1v1,f+m2v2,f total initial momentum = total final momentum

  8. A 76 kg boater, initially at rest in a stationary 45 kg boat, steps out of the boat and onto the dock. IF the boater moves out of the boat with a velocity of 2.5 m/s to the right, what is the final velocity of the boat?

  9. Perfectly Inelastic Collisions • A collision in which two objects stick together and move with a common velocity after colliding • Equation for a perfectly inelastic collision m1v1+m2v2=(m1+m2)vf • Be careful with signs for velocity! • Kinetic energy is not conserved

  10. Elastic Collisions • A collision in which the total momentum and the total kinetic energy remain constant • After the collision, the two objects move separately

  11. In real life… • Only particle collisions are truly considered elastic, however, some collisions are close enough to be approximated as elastic • Most collisions are somewhere between being elastic and perfectly inelastic

  12. A 1850 kg luxury sedan stopped at a traffic light is struck from the rear by a compact car with a mass of 975 kg. The two cars become entangled as a result of the collision. If the compact car was moving at a velocity of 22.0 m/s to the north before the collision, what is the velocity of the entangled mass after the collision?

  13. A 0.015 kg marble moving to the right at 0.225 m/s makes an elastic head-on collision with a 0.030 kg shooter marble moving to the left at 0.180 m/s. After the collision, the smaller marble moves to the left at 0.315 m/s. Neglect friction. What is the velocity of the 0.030 kg marble after the collision?

More Related