1 / 16

Dynamics Review

Dynamics Review. SPH4U – Grade 12 Physics Unit 3. Tribal Challenge!. An airplane flies due north over Sudbury with a velocity relative to the air of 235 km/h and with a wind velocity of 65 km/h [N 45º E]. Calculate the speed and direction of the airplane. 1 st Correct Answer – 3 points

doyle
Download Presentation

Dynamics Review

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. Dynamics Review SPH4U – Grade 12 Physics Unit 3

  2. Tribal Challenge! An airplane flies due north over Sudbury with a velocity relative to the air of 235 km/h and with a wind velocity of 65 km/h [N 45º E]. Calculate the speed and direction of the airplane. 1st Correct Answer – 3 points 2nd Correct Answer – 2 points Every Other Correct Answer – 1 point

  3. Tribal Challenge! An airplane flies due north over Sudbury with a velocity relative to the air of 235 km/h and with a wind velocity of 65 km/h [N 45º E]. Calculate the speed and direction of the airplane. Solution: 280 km/h [E 81º N]

  4. Tribal Challenge!- full solution

  5. Review - Dynamics Dynamics is the study of forces and the effects that forces have on the velocities of other objects.

  6. Review – Forces A force is a push or a pull. Forces are vectors, and always have a direction. Forces are measured in Newton's. 1 N = 1 kgm/s2 The net force (also called resultant force) is the sum of all the forces acting on an object. It is denoted as or

  7. Review – Free Body Diagrams A FBD (free body diagram) of an object’s motion shows all the forces acting on that object. It is an important tool for solving physics problems!

  8. Practice: A box sits stationary on a ramp that has an angle of elevation of 30º. Draw a free body diagram of this situation with all relevant forces.

  9. Practice: A box sits stationary on a ramp that has an angle of elevation of 30º. Draw a free body diagram of this situation with all relevant forces.

  10. Review – Newton’s Laws Draw a line between each description and the law it describes

  11. Review – Newton’s Laws Draw a line between each description and the law it describes

  12. Review – Friction Friction is a force that always opposes motion Friction occurs when one substance moves past another. There is friction between solids, liquids, gases – any two molecular substances in contact with each other will experience friction. The amount of friction is dependent on the types of substances. Some substances (like ice) provide less friction for our feet than others (like sandpaper).

  13. Review – Friction Kinetic friction is the friction that occurs between two objects that are in motion relative to each other. ( ) Static friction is the friction that occurs between two objects that are not in motion relative to each other. ( )

  14. Review – Friction The magnitude of friction can be calculated using the equations : Fk = μkFN (kinetic) or Fs = μsFN (static) Recall that: Fk or Fs are the forces of friction FN is the normal force μ is the coefficient of friction (a value that changes depending on whether we have static or kinetic friction. It also depends on the substance. See table 1 on pg. 85)

  15. Review – Friction The force of static friction opposes the force applied to an object and will increase as the force applied to the object increases until a maximum static friction is reached. This maximum is called the limiting static friction. At that moment, the object begins to move and will experience kinetic friction instead.

  16. Homework Read Sections 2.1 & 2.2 (Supplement your notes with this reading) Complete the following questions: Pg. 69 # 1, 4, 5, 6, 7 Pg. 76 # 3, 4, 6, 7, 8

More Related