Rotational Motion - Self Test

Question 1: The Right Hand Rule

Recall  = r x F = r F sin.

In both diagrams (parts a and b), the force vector F can be thought of as having acted on the arrowhead of moment arm r. However, F has been translated (moved) so that the two vectors are tail-to-tail. This was done in order to simplify the problem.

Part a
In the following diagram, use the right hand rule to find the direction of torque.

Figure 1

The direction of torque is:
    A. into the screen
    B. out of the screen
    C. to the left
    D. to the right
    E. upwards
    F. downwards

Part b
In the following diagram, in which direction is the torque?

Figure2

The direction of torque is:
    A. into the screen
    B. out of the screen
    C. to the left
    D. to the right
    E. upwards
    F. downwards

Solution

Go to Quiz 2