1 / 11

Momentum

Momentum . Learning Tweet . Units of momentum (change in momentum) = k gm /s Change in momentum depends on the size of the force and the time it acts Change in momentum = resultant force (N) x time (s). Unscramble the words & make two sentences . NCEDSTI EMIT ELVICYT HAGPR EPEDS

ramona
Download Presentation

Momentum

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

  2. Learning Tweet • Units of momentum (change in momentum) = kgm/s • Change in momentum depends on the size of the force and the time it acts • Change in momentum = resultant force (N) x time (s)

  3. Unscramble the words & make two sentences • NCEDSTI • EMIT • ELVICYT • HAGPR • EPEDS • CELECATNIOAR

  4. DISTANCE • TIME • VELOCITY • GRAPH • SPEED • ACCELERATION

  5. Momentum answers 1 A – football = 12.5 kg m/s Tennis ball leaving racquet = 3kg m/s Golf ball = 2.05 kg m/s B Car = 22000 kg m/s Lorry = 130 000 kg m/s Van = 77500 kg m/s C sprinter = 500 kg m/s Dog = 120 kg m/s Cyclist = 910 kg m/s

  6. Momentum answers 2 1 a 5000 kg m/s b 31 600 kg m/s c720 000 kg m/s d 480 000kg m/s • 1.8 x1029 kg m/s • 31.6 m/s (about 70 mph )

  7. Momentum answers 3 1 A 23000 kg m/s B - 5400 kg m/s 2 A 9 kg m/s B -9kg m/s C 18 kg m/s

  8. Change in momentum • Momentum = Mass x velocity • Force x time (during which the force acts) = change in momentum

  9. Problems • A snooker cue hits a ball. • The ball has a mass of 0.17 kg and starts moving with a velocity of 1.4m/s. • A What is the momentum of the ball • Momentum = 0.17 x 1.4 = 0.238 kg m/s • B The contact between the cue and the ball lasts for 0.1s. What is the average force exerted on the cue ball during this time? • F x t = change in momentum • F= change in mom/time = 0.238/0.1 = 2.38 N

  10. Problems (2) • A motorcycle with a mass 200kg has a rider with a mass 50kg. It is travelling at 27 m/s (60 mph) • a What is the momentum of motorcycle & rider • b What braking force is needed to bring the motorcycle and rider to stop in 5s?

  11. Problems (3) • A car (mass 1025kg) has collided with a brick wall. It was travelling at 23m/s(50mph) • What was the momentum of the car • The accident investigator estimated that it took 1.8s to stop. What average force was exerted on the car during the collision.

More Related