As discussed in class you should master Introductory Problem Set 5 before next Monday's class.

You should also submit your answers to the following questions:

`q001.  For each of the given objects on the various inclines estimate, based on a sketch as opposed to a formula, the parallel and perpendicular components of the object's weight as a percent of its weight.  Use your estimated percents to find the component of each weight parallel to the incline, and perpendicular to the incline. 

A car weighing 20 000 Newtons on an incline making angle 12 degrees with horizontal.

****

 

#$&*

A hotwheels car of weight 80 000 dynes on an incline whose angle with horizontal is 20 degrees.

****

 

#$&*

A block of weight 30 pounds on a 37 degree incline.

****

 

#$&*

`q002.  If the car in the first question experiences a frictional force which is 2% of the perpendicular component of its weight, then what is the magnitude of the frictional force?

****

#$&*

If the car is coasting downhill what is the sum of the parallel component of its weight and the frictional force?

****

#$&*

If the car is coasting uphill what is the sum of the parallel component of its weight and the frictional force?

****

#$&*

`q003.  If the hotwheels car in the first question is attached by a light thread to a washer weighing 20 000 dynes and suspended over a pulley at the lower end of the ramp, then if friction is ignored what is the net force acting in the direction down the ramp?

****

#$&*

Answer the same question assuming that the washer is suspended from a pulley at the top of the ramp.

****

#$&*

`q004.  How much frictional force would it take to hold he block in the first question stationary on the incline?

****

#$&*

What is this force as a percent of the weight of the block?

****

#$&*