WS5A (Moments of Forces with Drawing)

The principle of moments state that the ____ of clockwise moments is equal to the ____ of anticlockwise moments about the ______ pivot.

• product, product, same

• sum, sum, same

• product, product, different

• sum, sum, different

Taking moments about Pivot P, which of the following is correct?

• CW moment = W x 18

  ACW moment = 2 x (50 - 18)

• CW moment = W x (50-18)

  ACW moment = 2 x 18

• CW moment = 2 x (50 - 18)

  ACW moment = W x 18

• CW moment = 2 x 18

  ACW moment = W x (50-18)

Taking moments about Pivot X, which of the following is correct?

• CW Moment = T x 100

• CW Moment = 1.1 x 50 + 2 x 60

• ACW Moment = T x 100

• ACW Moment = 1.1 x 50 + 2 x 60

A force of 20 N is being exerted on the door at an angle. On the diagram, sketch the following 2 items:

1. 1. Line of action of the force (dotted line extended)

2. 2. Perpendicular distance from pivot to the line of action of the force

A force of 20 N is being exerted on the door at an angle. On the diagram, sketch the following 2 items:

1. 1. Line of action of the force (dotted line extended)

2. 2. Perpendicular distance from pivot to the line of action of the force

A force of 20 N is being exerted on the door at an angle. On the diagram, sketch the following 2 items:

1. 1. Line of action of the force (dotted line extended)

2. 2. Perpendicular distance from pivot to the line of action of the force