3. Mechanics

Moments — Quiz

Test your understanding of moments with 5 practice questions.

Practice Questions

Question 1

What is the net moment about the pivot, taking anticlockwise as positive, for a 30\,N upward force applied at 0.4\,m and a 15\,N downward force applied at 0.6\,m to the right of the pivot?

Question 2

A uniform beam $6\,$m long weighing $600\,$N is simply supported at both ends. A $300\,$N point load is placed $2\,$m from the left support. What is the reaction force at the left support?

Question 3

A $4\,$m beam weighing $200\,$N has its center of mass located $1.5\,$m from the left end and is supported at both ends. What are the reaction forces at the left and right supports?

Question 4

A uniform beam $6\,$m long weighing $180\,$N carries a $30\,$N weight at $1\,$m and a $50\,$N weight at $4\,$m from the left end. At what distance $x$ from the left end must a pivot be placed so the beam is in rotational equilibrium?

Question 5

For a lever with effort arm length $0.8\,$m and load arm length $0.2\,$m, what is its mechanical advantage?