PLTW/POE/EOC/STATICS

When breaking a force or vector down into its X and Y components. Which trig functions do we use, and when do we use them?

• SINE - For the X component

  COSINE - For the Y component

  INVERSE TANGENT - For the angle of the resultant

• SINE - For the Y component

  COSINE - For the X component

  INVERSE TANGENT - For the angle of the resultant

• It doesn't matter, the results will be the same

Tags

CCSS.HSN.VM.A.3

When breaking a force or vector down into its X and Y components. We try to always measure the angles from which axis?

• X

• Y

• It doesn't matter, the results will be the same

What is the sine of 104.3? Give answer to a precision of 0.XXXX

• 0.9691

• 0.969

• 0.9690

Tags

CCSS.HSF.TF.C.8

What is the cosine of 298.38? Give answer to a precision of 0.XXXX

• 0.4753

• 0.4752

• 0.4754

Tags

CCSS.HSF.TF.A.2

A 50 pound force is directed 39 degrees above the positive x-axis. What is the value of the Y-Component. Use a precision of: XX.XX

• 38.86

• 38.85

• 31.47

• 31.46

Tags

CCSS.HSN.VM.A.3

A force of 32 N is directed at an angle of 32 degrees below the Positive X-Axis, what would this angle be if measured all the way around from above the positive x-axis?

• 32 degrees

• 148 degrees

• 212 degrees

• 302 degrees

• 328 degrees

If the force applied where the two members meet is 150 pounds directed down, what type of force is felt within each member?

• Tension is felt in member 1 and member 2

• Compression is felt in member 1 and member 2.

• Tension is felt in member 1, and compression is felt in member 2.

• Compression is felt in member 1, and tension is felt in member 2.

The coefficient of friction depends on

• area of contact

• shape of surfaces

• strength of surfaces

• nature of surface

Kinetic friction is the

• tangent of angle between normal reaction and the resultant of normal reaction and the limiting friction

• ratio of limiting friction and normal reaction

• the friction force acting when the body is just about to move

• the friction force acting when the body is in motion

For a static’s problem, your calculations show the final answer as 12345.6 N. What should you write as your final answer?

• 12345.6 N

• 12.3456 k N

• 12 k N

• 12.3 k N