4/26

A 10.0 kg box is pushed from the top of an incline and travels down the incline with an initial speed of 5.00 m/s.  The incline is 4.00 m long and the angle of the incline is 37.0 degrees.  The coefficient of friction between the box and the incline is 0.400.  Determine the a) loss of potential energy and b) work done by friction.  c) Use the work-energy theorem to determine the velocity of the box at the bottom of the incline.

4/25

Objective:  SWBAT determine the limit that defines the terminal velocity of an object that encounters velocity dependent resistive forces.


Warm Up:  You are 1000 m high in an air balloon and you drop your physics book overboard.  Sketch the d vs t, v vs t and a vs t graphs for the book (assume that at some point it reaches terminal velocity).

4/24

Objective:  SWBAT determine the force on an object (Review of Forces)


Warm Up:  A 2 kg mass is pushed 0.5 m into a spring with spring constant 200 N/m on a frictionless horizontal surface.  Upon release, the mass travel across the surface until it encounters a rough incline.  The mass moves up the incline and stops at a height of 1 m above the horizontal surface.
a.  How much work must be done to compress the spring initially?
b.  What is the speed of the mass at the base of the incline.
c.  How much work was done by friction on the incline?

Physics: Retarding and Drag Forces

4/20

Objective:  SWBAT calculate projectile motion.

Warm Up:  Pick up a half sheet of paper.  Place your answer to the warm up on the paper.  You must do your own work. You have 4 minutes.


A projectile is fired with an intial speed of 113 m/s at an angle of 60 degrees above the horizontal from the top of a cliff 49 m high.  Determine the time to reach maximum height and the total time of flight.