Equilibrium Problems and Inclined Planes

We had a lot done in class today. First, we continued in going through the PHYSICS 40S INTRODUCTORY UNIT WORKSHEET: VECTORS (numbers 4-8). Next, we went through the questions at the last page of the DYNAMICS UNIT-EQUILIBRIUM handout. ALL ANSWERS ARE ON THE SLIDES POSTED BY MS. K.

After going through the sheets, Ms. K started discussing about INCLINED PLANES. After that, she told us to read pages 194-196 from the book and solve the problems on page 196, 1-4.

Here are the questions:

1.A copy of Physics: Concepts and Connections leaves the printing press and slides down a 4.0-m-long ramp into the arms of an eager physics student. If the ramp is inclined at an angle of 250 to the horizontal and has a coefficient of kinetic friction of 0.10, how long will it take the 2.0-kg textbook to reach the student?

2.The plastic case from your least-favourite CD recording is flung up a frictionless ramp, inclined at an angle of 200 to the horizontal. If the case leaves your hand at a speed of 4.0 m/s, how long will it take before the case comes to rest?

3.A skateboarder slides down a frictionless ramp inclined at an angle of 300 to the horizontal. He then slides across a frictionless horizontal floor and begins to slide up a second incline at an angle of 250 to the horizontal. The skateboarder starts at a distance of 10m from the bottom of the first incline. How far up the 2nd incline will he go if the coefficient of kinetic friction on the 2nd incline is 0.10?

4.Batman is driving the Batmobile down a hill coming from the Bat cave. The hill is inclined at an angle of 300 to the horizontal and has a coefficient of kinetic friction of 0.28. What force must the Batmobile’s engine apply to cause the Batmobile to accelerate at 0.60g?

The DYNAMICS SHEET IS DUE ON THURSDAY guys!!!
That’s all for today/tonight… have a good night. =)





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