A Safe Assignment, Newton's Laws Preview

Dropping A 300lb. Safe On A Buick

This weekend's homework:
(1) Based on how long the safe took to hit the Buick, how tall is the building?
(2) Provide (& explain) examples of inertia from this demonstration.
(3)What forces are acting on
(a) The safe?
(b) The Buick?

You may e-mail your answer to Mr. B directly or enter it as a comment on this blog (either way, you have to show your work. Blog responses will not be published until after the assignment due date.)

Here's a helpful kinematics video (The Physics of Martials Arts)sent in by Montessori's Ms. Guglielmini:


Up Next for the Class: Newton's Laws
Here's a brief Tutorial on Newton's Laws using Hypothetical examples (and the same Prentice Hall Conceptual Physics textbook we use):

note: projectile motion is not included

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?