# Lesson 6

Chapter 2 Forces
Section 2 More than one force
This lesson
• Extension
• Spring constant
• Resultant force
• Checking the homework
• Extra exercise
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Slide 1: Slide
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This lesson contains 11 slides, with text slides.

Lesson duration is: 45 min

## Items in this lesson

Chapter 2 Forces
Section 2 More than one force
This lesson
• Extension
• Spring constant
• Resultant force
• Checking the homework
• Extra exercise

#### Slide 1 -Slide

Force and extension

#### Slide 2 -Slide

Force and extension

#### Slide 3 -Slide

Force and extension

#### Slide 4 -Slide

Force and extension
C=xF
C: Spring constant (in N/m)
F: Force (in N)
x: Extension (in m)

#### Slide 7 -Slide

Worksheet resultant force

#### Slide 8 -Slide

Parallelogram method
• 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.