1 Choose a suitable scale of forces so that the arrows aren’t too long or too short.

2 Draw in the two forces at the correct scale and at the correct angles.

3 Complete the parallelogram with two dotted lines.

4 Draw the resultant as an arrow from the origin to the opposite corner (the diagonal).

5 Measure the length of the arrow. Use the scale of the forces to determine the magnitude of the resultant force.

6 Determine the direction of the resultant by measuring the angle.

Slide 9 - Slide

Checking the homework

Slide 10 - Slide

Practice exercise

On an experimental setup on the moon a weight with a mass of 5 kilogram is hung on a spring with a spring constant of 0,45 N/m. Calculate the extension of this spring.