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Friction
Investigation 4
Investigation 4
Friction
Phase 1 – Defined Understanding
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Teacher PreLab
Prepare for the Experiment
Phase 2 – Dynamic Understanding
► Investigation Four Summary – Lab Goals
In Investigation Four, you explored the frictional force of different types of surfaces. During this Investigation, you:
1. Pulled a wood block 50 cm to measure the frictional force for varying surface combinations.
2. Measured the mass of the wood block in grams using a triple beam balance.
3. Convert grams to kilograms using the following formula: Kg = grams / 1000
4. Calculate the coefficient of friction using the following formulas:
Weight (N) = mass (kg) × acceleration due to gravity (9.8 m/s2)
Coefficient of Friction = Frictional Force (N) / Normal Reaction Force (N)
► Investigation Four Summary – Learning Goals
Through these experiments, you concluded that:
1. The smoother the two surfaces, the less frictional force. The less smooth the two surfaces, the more frictional force.
Launch Concept Slides/Annotations
Mathematics Concepts in This Investigation
- comparing (non)measurable characteristics
- qualitative/quantitative properties
- comparing (non)measurable characteristics
- (in)direct relationships
- data table
- predict/verify results
- length/distance in cm
- measuring mass
- mass in grams
- measuring force
- decimals to the nearest tenth
- calculating frictional force
- multiplication
- metric conversion
- division
- line graph
- patterns/trends
- (in)dependent variables
- skip counting by 0.2
- data analysis
- problem-solving