1 / 15

Physics

Physics. Newton’s Laws. Newton’s First Law: The Law of Inertia . A body at rest and a body in motion continues to move at constant velocity unless acted upon by an unbalanced external force. Newton’s Laws. Newton’s Second Law:

wagnere
Download Presentation

Physics

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. Physics

  2. Newton’s Laws Newton’s First Law: The Law of Inertia. A body at rest and a body in motion continues to move at constant velocity unless acted upon by an unbalanced external force.

  3. Newton’s Laws Newton’s Second Law: The Law of Acceleration. A net or unbalanced force acting on an object equals the mass of the object times the acceleration of that object.

  4. Newton’s Laws For Centripetal acceleration:

  5. Newton’s Laws Sample Problem: Find the acceleration of a 3 slug object acted upon by a net force of 1.5 lbs.

  6. Newton’s Laws Sample Problem: A 50-kg block rests at the top of the plane whose length is 2.00 m and whose height is 0.50 m. How long will it take for the block to slide to the bottom of the plane when released?

  7. Newton’s Laws Solution: Draw the vector diagram first.

  8. Newton’s Laws Next establish the relationship:

  9. Newton’s Laws

  10. Newton’s Laws

  11. Newton’s Laws Newton’s Third Law: The Law of Interaction. No matter what the circumstance, when one object exerts a force, the second must exert an exactly equal and oppositely directed force on the first.

  12. Newton’s Laws For propeller problems, it is given by the formula: where:

  13. Newton’s Laws Sample Problem: Each second a propeller accelerates an air mass of 12.2 slugs from rest to a velocity of 137 ft/sec. How much thrust is provided?

  14. Newton’s Laws Solution:

  15. Exercises • Find the net force on a 5 slug object which is accelerating at 3 ft/sec? • At an altitude of 10,665 m and a cruising speed of 252m/sec, the Pratt & Whitney JT 9D-7F in the Boeing 747 has a mass flow of 879 kg/sec and an exhaust velocity of 306 m/sec. Find the thrust. • A 60 lb block rests on a smooth plane inclined at an angle of 20˚ with the horizontal. The block is pulled up the plane with a force of 30 lb parallel to the plane. What is its acceleration?

More Related