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Friction
Investigation 3
Investigation 3
Friction
Phase 1 – Defined Understanding
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Teacher PreLab
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Phase 2 – Dynamic Understanding
► Investigation Three Summary – Lab Goals
In Investigation Three, you investigated weight and surface area and how they affect frictional force. During this Investigation, you:
- Determined the mass of each of the following loads:a. Woodbox
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- Wood box and 100 g
- Woodbox and 200g
- Wood box and 300 g
2. Converted mass in grams to kilograms using the following formula:
Kg = Grams / 1000
3. Calculated the weight of each load using the following formula:
Weight (N) = mass (kg) × acceleration due to gravity (9.8 m/s2)
4. Measured force by pulling a wood block on each of its (3) surfaces:
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- Bottom
- Side
- End
5. Calculated the surface area of each of the surfaces on the wood block by using the following formula:
Surface area (cm2) = length (cm) × width (cm)
► Investigation Three Summary – Learning Goals
Through these experiments, you concluded that:
- As the weight of a load increases, the frictional force between the load and the surface it moves on increases.
- As the surface area of a load increased, the frictional force between the load and the surface remained constant.
Launch Concept Slides/Annotations
Mathematics Concepts in This Investigation
- (in)direct relationships
- mass in grams
- measuring mass in grams
- metric conversion
- division
- predict/verify results
- data table
- multiplication
- calculating weight in Newtons
- decimals to the nearest tenth and hundredth
- measuring force
- line graph
- (in)dependent variables
- patterns/trends
- skip counting by 0.2 and 0.5
- data analysis
- calculate surface area (cm2)