Thursday, November 16, 2006

A Problem or Two

An elephant jumps sideways from a 25 meter-tall platform. He jumps from the platform with an initial velocity of 4 meters per second to the right.

1) How long till he lands?

2) How far from the platform will he land?

3) In the instant before he lands, how fast is he moving to the right?

4) In the instant before he lands, how fast is he falling?

Another Problem to consider:

A plane is heading East at 115 meters per second, flying at an altitude of 1050 meters. A clown jumps out of the plane.

1) How long will the clown be in the air, from the moment he leaves the plane to the moment he hits the ground (don't worry, clowns bounce!)

2) How fast will he be moving to the East in the instant before he hits the ground?

3) How fast will he be falling in the instant before he hits the ground?

4) How far, from the point where he left the plane, will the clown land.

5) What does Mr. B have against clowns and elephants?

Tuesday, October 17, 2006

Exam Prep

A few links to conceptual and actual practice problems and further info...

In general, your best bet is to check out the first couple of chapters in The People's Physics Book. The questions at the end of the units & problem-solving chapter and the one-dimensional motion chapter are comperable to what you can expect to see on the exam.

Other helpful links for conceptual understanding and practice problems:
  • General Summary from the Saint Mary's (Manhasset NY ) website.
  • Position, velocity and Acceleration at the fabulous Fear of Physics website

  • Stuff to know:
    • Units, Scientific Notation, Significant Digits
    • Distance vs. Displacement, Scalar vs. Vector
    • Vectors, vector addition, Vector Diagrams
    • Average Velocity, Constant Velocity, Instantaneous Velocity
    • Free Fall, Up & Down Free Fall
    Does everything fall at the same rate?

    Motion / Graphing Motion:
    (Velocity, Distance, Acceleration)
  • The physics of motion along a line
  • Describing motion with words
  • Describing Motion with Diagrams
  • Free Fall and the Acceleration of Gravity
  •